Yahoo Sports NFL on Darius Cooper

Cooper in 12 personnel creates nine-man box, negating play-action threat.

The Eagles' use of 12 personnel with Cooper brought tight to the formation creates something close to a nine-man box, which undermines offensive efficiency. With only two legitimate vertical threats in the formation, the Titans do not have to respect play-action enough to create hesitation, allowing linebackers to attack downhill and meet the run in the backfield. The Eagles are repeatedly asking the line to create movement against unfavorable numbers while giving the second level no reason to slow down, with the design contributing to run-game failures.

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