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If Anthony Spencer is willing to play for the Eagles, this could very well be a great fit. Spencer is not young, but he's also not terribly old, being currently 29.
He is also coming off a career year, leading the entire Cowboys defense with 95 tackles and racking up 11 sacks.
Although Spencer has stated his desire to remain a Cowboy, the prospects do not look good for him to remain in Dallas.
After such an incredible season, he will certainly demand to be paid accordingly, and it will be difficult for the Cowboys to fit that under their salary cap. And at his age, they may not want to.
If he is willing to join an NFC East rival, the Eagles could suit him nicely. If the Eagles switch to the 3-4, they will need a player with 3-4 experience on the outside to play opposite Mychal Kendricks. And his proven ability to get to the quarterback would greatly help a 2012 unit that struggled mightily to do so.