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Base Offense: Extreme spread with zone-blocking scheme
Before getting into the real nuts and bolts of Chip Kelly's offense in Philadelphia, it is important to take a look at how his personnel matches up.
The decision to select ultra-athletic tackle Lane Johnson in the first round of April's draft should tell you all you need to know about what type of blocking scheme Philadelphia plans to utilize in 2013. It will rely heavily on more athletic offensive linemen to get off the snap and pull to whichever direction the play calls for.
In addition, it enables cross or reverse blocking assignments within the same formation. This means that LeSean McCoy and Bryce Brown will be running away from the grain a great deal.
As it relates to Philadelphia's base offense, it's complex in nature.
You have already heard about the extreme spread and up-tempo scheme utilized at Oregon. That really won't change with the Eagles.
If practices are any indication, Philadelphia's tempo will rival that of the New England Patriots. There will be little huddling on the field, plays will come in at a frantic place and new personnel groupings will be utilized within the same formation on consecutive plays.
New additions Zach Ertz and James Casey are versatile "tight ends" who can line up in a variety of formations. Ertz was utilized in the slot, on the outside and even in the backfield at Stanford. Meanwhile, Casey is more of your H-back, who will be called upon to block a great deal. That being said, he can also line up off the shoulder of the tackle and in the slot.
It's all about spacing and formation. Getting three wide, finding a mismatch between the hashes and opening up the field for running backs both inside and outside.
As you can see here, Kelly isn't afraid to bring a fullback in on a spread formation. You will see a screen to one of the three players in the backfield with a wide receiver as a lead blocker down the field.
In all honesty, it's mayhem in its truest form.