This isn't a cop out, since you asked me who I THINK will start, as opposed to who I would start...I could see either QB starting. If I had to wager, I would say Rudock if healthy but there is a plan for CJB to come in the game and play throughout.
If that happens, I won't be a big fan of it, unless it's to bring CJB along more...because there is nothing Rudock can do that CJB can't, but the reverse is not true. So I wouldn't want to play both for an extended period of time.
Jon,
I am certain it will be Rudock if he is healthy, and I have my doubts that CJB will see the field of that's the case.
Ferentz made it clear, in his post-game comments, that he played CJB because Rudock was hurt, and that he was surprised by his performance in the game. He didn't make the decision, it was forced by injury, and he'll go back to his practice-proven, safe quarterback. Since he isn't going to start CJB, it does make the most coaching sense not to play him.
With Rudock's injury, if it heals, he's not going to want to risk injury to his backup by playing him in live series when his chosen starter might also get hurt in love series. CJB will be put back into his back pocket for a rainy day.
I think he should start CJB, but he's not going to and thus needs to save him in case JR gets injured. You can't play them both or you'll be sunk if they both get hurt.