My gut says start him but I have a question for those of you that know a lot more about this than me. what is the impact of him sitting out/getting limited reps this week?
I would assume it means that anything new that the OC's install he will have limited experience with and is less likely to use in the game. Montez would likely have the edge on any pieces they added for Oregon unless of course you assume that Sefo is so far ahead of Motez skills and "head for the game" wise that Sefo can get it down pat by reading it and Montez can't get it with repetition.
Additionally, does Montez have any wheels at all? Do we really feel that limited Sefo is more mobile than fully healthy Montez?
Again, not arguing one way or the other. Personally the only way I wouldn't start Sefo is if he told me he couldn't go. If that man says he can play I'd hand him the ball and get the door for him.
All good points. Which is why you start Sefo if he can go. If he isn't right, you bring Montez in after things have settled down a bit, he's not as nervous as he'd be starting, and CU's offensive coaches have a feel for what Oregon is doing in their defensive game plan.