Having a 10% +/- chance of making the playoffs played a large role in Rex's decision to play Sanchez this weekend.
Face it, we could probably win out with any QB we have on the roster, but then what?
Obviously Rex felt that Sanchez with 4 road playoff wins and an ability to play better in the playoffs than in regular season would probably be his best bet in the WC playoff round and possibly beyond.
That being said, if the POs become unattainable, then look for McElroy or Tebow to play out the season 'just because'.
I went on a 30 day diet and so far I've lost 17 days