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Vontae Davis out all right, but for mysterious reason

No one expected cornerback Vontae Davis to play in Sunday's game against the Kansas City Chiefs because he's had a chronic hamstring injury that has had him in and out of the lineup.

Well, moments ago the Dolphins confirmed Davis indeed will not play -- missing his fourth game of the season. But the club announced it was for 'non-injury" reasons.

The club also said defensive end Phillip Merling, who is having the worst Dolphins contract year in the history of contract years, will be scratched for the third consecutive week. He is also out for non-injury reasons.

The Dolphins also announced the signing of receiver Julius Pruitt to the active roster, a promotion from their practice squad.

Non-injury reasons cover a wide swath of things.

A healthy scratch (not good enough to play) is a non-injury reason.

A benching for violating of team policies is a non-injury reason.

I will try to get you the reason for Davis being out. I can tell you this: He has not been thrilled with the manner in which his hamstring injury has been handled so far this year. He's been quite frustrated, according to a team source.

But the Dolphins have been working hard to manage his injury and try to get him back on the field. The club's frustration has been that Davis hasn't made the kind of progress that is typical with such an injury.

[Update: There's a report on NFL.com that Davis almost got into a fight with Brandon Marshall at practice this week. Interesting. But that is not the reason Davis was left behind for this game.]