I guess I don't see a JC QB coming in to be anything but depth, unless the staff doesn't like Noland. Moore's knee basically puts him and Mitchell at the same level given Mitchell's early enrollment, JC might actually be behind them unless the JC could also enroll early. Not ideal to have a Freshman backup, but an incoming JC might not be much better if can't early enroll.
All 3 can run better than either of this year's QB's, excluding Lanning since he was just a "package" guy, so that will add a dimension.
So QB is a concern, OL is concern at least early, safeties/star and LB are concerns, hopefully kicking isn't but if it is, uh-oh. Will be LOTS of youth next year, may be a step back since this year's team is over-achieving. Certainly won't sneak up on anyone next year, although the schedule seems a little better.