Portis: Sit or Start Him?

[hagams]

I was talking with some people last week right after the Giants game about Portis. Does anyone know what incentives are in his contract? No games missed, leads the league in yards by the end of the season type stuff? He could be chasing money, but I don't think CP is totally motivated by that.
I think without CP in the game or chances of winning get cut down big. Let him get his start, bring him in on a couple first downs but let him rest. He's having a big year, and we are still in the playoff hunt, Portis will not let himself not be in this game.