re: Is Chip Kelly's failure in the NFL proof that JFF will fail too?

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NFL defense are too athletic for that.

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Just the opposite of what you think. The real problem is the Philly defense is on the field waaaay too much. They are giving up lots of points in the 4th Q.

NFL defensive players cannot stay on the field that many plays. Philly losing time of possession even when they are scoring points. They do not have enough players to rotate out on defense to stay fresh.

So while it is a defensive problem, it is Philly's own defense that is going to cause this experiment to fail.