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Roc Carmichael

Flipping Jenkins and Allen helped Eagles defense

Flipping Jenkins and Allen helped Eagles defense

— Long before Chip Kelly ever arrived as the head coach, the Philadelphia Eagles employed a defensive system in which the safeties were never defined. Both had to be interchangeable and often were.

That's one of the few things Kelly never bothered to change.

Nevertheless, until Thanksgiving's showdown with the Dallas Cowboys, we had mostly seen a de facto setup of Malcolm Jenkins at strong safety and Nate Allen at free safety.

That dynamic was flipped for Thanksgiving's matchup against the Dallas Cowboys, as the more polished Jenkins was dropped into center field, with Allen playing up closer to the line, often right up in the box.

The results were...