What on Earth is wrong with the ' high-powered attack?The offense that torched opponents at will during the preseason has been unable to score points or generate first downs consistently. Chip Kelly's squad struggled mightily in back-to-back lo ses to open the regular season. The ' vaunted running game has mustered just 70 total yards () and looks nothing like the guy who . In addition, the experiment looks quite suspect in the early goings, with the former No. 1 overall pick struggling to string together completions on the perimeter.Given some time to take a long, hard look at to a se s the ' offense through two games, I've come up with three reasons why Kelly's bunch is out of sync this season:1) The Eagles can't run behind a leaky offensive line.For all of the conversation about whether and are miscast in the ' offense, the poor play of the offensive line has been the primary reason why the running game has looked so horrendous in 2015. The have been thoroughly whipped at the line of scrimmage Harry Carson Jersey by each of their opponents, exhibiting a lack of chemistry and continuity that is surprising for a unit featuring three -caliber players (, and ). One big i sue: That trio has been hindered by the disappointing play of guards and .The unceremoniously dismi sed a pair of veteran starters on the interior ( and ) during the offseason, and their replacements have struggled with their a signments up front. Barbre and Gardner repeatedly have allowed penetration through the A-gaps, leading to disruption and chaos at the point of attack.Given the inexperience of the duo -- prior to this season, each guy had made eight career starts in the NFL -- opponents succe sfully have targeted the middle of the ' line to destroy the timing and rhythm of the zone-based running game. Coaches are instructing their defensive tackles to slant or angle through the A-gaps to blow up inside- and outside-zone runs. The quick lateral movement of the defensive tackle not only creates instant penetration against dive plays, but it allows linebackers to run unimpeded through gaps to meet runners in the hole. The tactic is also effective against outside runs when defensive tackles jump in the hip pocket of pullers at the line. This prevents the puller from getting around the corner and blocks the path of additional pullers on the backside.Against the in Week 1, the interior penetration prevented Murray from finding running lanes on outside zone Phil Simms Jersey plays. In the play depicted below, the are aligned in a trix formation with Murray positioned on the left. He is instructed to take the handoff around the corner to the right with a pair of pullers in front (Kelce and Gardner). The ' anticipates the snap and jumps through the A-gap. With Kelce and Gardner pulling around the corner, Babineaux's quick penetration destroys the timing of the play and forces Murray to bounce into the awaiting arms of . This results in a 12-yard lo s for the (TO VIEW THE PLAY, SCROLL LEFT TO RIGHT ON THE IMAGE BELOW):In the fourth quarter of that game against the , on a critical third-and-1, the were unable to handle the penetration from the defensive line. As evidenced in the play breakdown below, the ' defensive line executes a slant to the strong side. At the snap, dives through the A-gap, leaving an open lane for when Gardner steps down with Biermann. With a free run to the running back, Worrilow stops Mathews in the backfield and prevents the from moving the chains (TO VIEW THE PLAY, SCROLL LEFT TO RIGHT ON THE IMAGE BELOW):That third-down stop was absolutely crucial for Atlanta -- kicker mi sed on the very next play, allowing the to maintain the 26-24 lead that would end up being the game's final score.Against the in Week 2, the again failed to neutralize penetration at the point of attack. In the play below, Mathews is positioned as the dot back in a deuce formation on 2nd-and-8. The are countering with a seven-man box, and is instructed to slant into the A-gap at the snap. The 6-foot-4, 290-pound defensive tackle gets a great jump on the snap and explodes through the hole, forcing Mathews to bounce to the outside. safety closes the door on the play and nails Mathews at the line of scrimmage for a minimal gain (TO VIEW THE PLAY, SCROLL LEFT TO RIGHT ON THE IMAGE BELOW):The ' offensive guards aren't the only underachievers along the line. Tight end has struggled sealing defensive ends; his inability to keep them at bay has resulted Graham Gano Jersey in a few negative runs. If the hope to rectify their running woes, they must get better play from their front-line personnel at the point of attack. Otherwise, Murray and Mathews will continue to run to darkne s, and the ' running game will remain a sore spot for Kelly. Of course, it doesn't help that Murray (hamstring) .2) Sam Bradford hasn't found his groove in Chip Kelly's offense.When Kelly handpicked Bradford to direct his offense as the ' new franchise quarterback -- sending last year's starter, , to St. Louis in the quarterback swap -- the move was met with much skepticism based on the veteran's extensive injury history. Bradford managed to play in just seven games over the past two seasons, thanks to back-to-back ACL injuries, and entered the season with 31 mi sed games in his five-year NFL career. Not to mention, he mi sed significant time at Oklahoma dealing with injuries to his throwing shoulder.Despite those concerns, I thought Bradford was a nice fit in Kelly's quick-rhythm system, based on his judgment, anticipation and accuracy. When healthy, Bradford consistently delivers the ball on target and his keen sense of timing allows him to throw to open receivers down the field. Also, Bradford had exhibited sound judgment as a pocket pa ser in the NFL, as evidenced by his 59:38 touchdown-to-interception ratio prior to the season.But looking at of Bradford's play during the first two weeks, I see a veteran pa ser attempting to shake off the rust while re-adjusting to the speed of the NFL game. Bradford's timing and mechanics are out of sync in the pocket, resulting in errant throws and misfires on short and intermediate routes. In addition, Bradford is still trying to regain his comfort while throwing with bodies around him in the pocket. Suffering multiple knee injuries can make a pocket pa ser jittery under dure s. Thus, it is not surprising to see Bradford failing to consistently step into his throws with rushers in close proximity. When he becomes more comfortable and confident in his knee, he will take a full stride into each of his throws to achieve maximum velocity. Moreover, he will deliver accurate to ses well within the receiver's strike zone.If I had to cite a concern about Bradford's game after studying the tape, I would point to his judgment under dure s. The former Heisman Trophy winner has been a solid decision maker throughout his football career, eschewing risky throws for checkdowns in most instances. In Philadelphia, however, he hasn't shown discipline and restraint as a pa ser. He has attempted to fit balls into tight windows; these contested pa ses have resulted in him having twice as many interceptions (4) as TD strikes (2). Against the , Bradford's lack of patience and discipline resulted in a pair of costly interceptions, including a red-zone pick that kept the from closing the gap in the third quarter. On the play, as you can see just below, the are running a mesh route with multiple short cro sers and a deep-middle hook between the hashes. Bradford is instructed to check out the running back on the swing before looking at the shallow cro s and hook over the middle. The have the play perfectly defended, which should lead Bradford to throw the ball away. Instead, he attempts to make a hero throw to tight end despite 's fine coverage. The instinctive linebacker steps in front of Ertz and steals a pick on a poor decision by Bradford (TO VIEW THE PLAY, SCROLL LEFT TO RIGHT ON THE IMAGE BELOW):Bradford has hardly justified the surprising deal that landed him in Philadelphia, but fans should hold out hope that the veteran pa ser will turn it around. He has shown flashes of stringing together completions with a deft touch (see: second half of the Atlanta game), but he must reduce his turnovers and miscues to keep Philly in these highly competitive contests. If he can regain his confidence and rhythm as a thrower, Bradford should be able to help the dig out of their slump. Of course, the quarterback also needs to get some help from his pa s catchers ...3) The Eagles lack star power at wide receiver.It is a not a prerequisite for an elite NFL offense to feature a top-five talent on the perimeter, but it is harder to field a dominant attack with complementary weapons occupying key roles in the pa sing game. When Kelly arrived in Philadelphia, the had electric playmakers in and . Each player was Mark Bavaro Jersey capable of delivering explosive plays as a vertical threat, but also showed the elusivene s, wiggle and burst to turn short pa ses into big gains. With both players now plying their trades elsewhere, the lack a dynamic weapon on the perimeter with game-changing potential. Thus, Philadelphia is forced to play "connect the dots" from the pocket, which is tough to do against elite defenses in critical games.Looking at , I don't believe the have a legitimate home-run threat in the receiving corps. and are pedestrian pa s catchers with limited impact potential as playmakers. and are capable "MOF" (middle of the field) chain movers, but neither has provided enough impact plays to become a focal point of a game plan. Thus, the are forced to count on their young players -- second-year pro and rookie -- to carry the pa sing game with their skills on the perimeter.Frankly, I've been disappointed with the play of both youngsters to this point. Neither has performed like a WR1; the ' pa sing game has been grounded due to their inability to win against elite corners. This was apparent in each of Philadelphia's lo ses, with the duo failing to come through with big plays when the games hung in the balance. While Matthews racked up respectable numbers in both contests, Saquon Barkley Jersey he failed to make the kind of impact plays that alter the way opponents direct their coverage. defensive coordinator Rod Marinelli was comfortable playing Cover 1 (man-free) for most of last Sunday's game without using a bracket or double-team on the ' leading pa s catcher.Agholor has been a major disappointment with only four receptions for 36 yards and zero touchdowns on the season. The ' first-round draft pick has struggled to create separation from defenders down the field; his inability to get space has encouraged opponents to use more bump-and-run tactics on the outside to suffocate the pa sing game. Granted, Agholor is a rookie still adjusting to the nuances of the pro game, but the were counting on him to deliver some of the explosive plays routinely provided by Maclin and Jackson in previous seasons. Without a credible deep threat on the field, the will continue to see opponents crowding the box to stop the run and daring Bradford to take his shots in the pa sing game.Follow Bucky Brooks on Twitter .