I don't see him starting at QB as RS Soph. If he doesn't start as a RS Frosh, we would have either Vandenburg or Wienke as a senior returning starter, so there would have to be major issues for that person not to be the guy. But he could compete for a job as a RS Frosh or step in if one of the other two pulls a Christensen.
Besides QB, I think LB is most realistic. For the US Army All-American Bowl roster, he is listed as a DB, but I think that he is a little big/maybe not fast enough, so LB would be a good fit.