IMHO AJ Derby would be a fool to not take this opportunity to play LB. Now is his chance, not just because I don't think he will play QB, but because he has a chance to help this team to his best ability. That and he will not get the opportunity again, barring injury, if someone else claims the position and plays solid. That is Ferentz football. Play the starters no matter what, all the time, nobody else. That is one of only two things that I disagree with on Ferentz football, but it is also one that would not allow AJ another chance - if he misses his opportunity and another LB shines next season.
Now if AJ stays at QB I will call him a fool again. Why? Because he isn't that good. You have a slightly above average running QB and a below average passer. Does that make a winner for a top Big Ten team??? He barely complete 50% of his passes! And that was in HIGH SCHOOL! On a very talented City High team... JV completed 70% of his passes, Wienke and Ruddock were something around 65-67%. Lookup ANY decent college QB and you will not find ONE of them that is around 50% completion. Not one. And that is college, not high school. I am not buying the "he can run" horse crap. He can run ok, but he can't run that great. Now if he could run Brad Banks good, I would be on the side of letting him try to play QB. For sure. But he can't.
So AJ, play LB or rot your talents. End of story.