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Big name free agent Nnamdi Asomugha signed with the Eagles
The Eagles have a clear philosophy in the arrangement of the 2011 defense: Stop the opposition pass. They're clearly banking on their ability to score, and score quickly, with Michael Vick, Jeremy Maclin, DeSean Jackson, et al.
That means they can fairly safely assume the opposition will be passing early, and passing often, if only because they have to catch up to the Eagles. For that reason, they've got a heavy pass-rush ability: Trent Cole and Jason Babin at DE with Darryl Tapp and ex first-rounder Brandon Graham as depth, and pass-rushing interior lineman Cullen Jenkins at DT.
Their linebacker corps isn't elite but is useful and probably won't be called upon to stuff the runs given they won't be coming often.
In the secondary, they have players to burn. Three better-than-average to elite cornerbacks in Asante Samuel, Domonique Rodgers-Cromartie and Nnamdi Asomugha, safeties Nate Allen, Kurt Coleman, Jaiquawn Jarrett and Jarrad Page allows the Eagles to cover injuries or mix and match to suit.
Their special teams also have ability, especially with Jackson returning punts. They also have fourth-round rookie kicker Alex Henery to test out.
The reason they're fourth is that their strength is also their weakness: It's as if they're entirely reliant on being able to put points on the board early. If they don't, then the other team can run, and given their weakness at run-stuffing DT and LB, other teams may be able to run on them.
They can't even call upon safety Quintin Mikell, as he's now elsewhere.