How can a record breaking, national champion, Heisman winning quarterback who went 27-1 in his college career develop any more on the football field? I get that you mean the character concerns, but I don't think another year in college would improve his mental makeup. That's in his low-hairline/Hebrew DNA
I don't know the list of high level NFL quarterbacks who declared after their sophomore year but I doubt it is very long.
Even Luck and Manning stuck around an extra year when they could have easily went into the draft and been drafted very high.
That plus the lack of maturity is a cause for concern.
Succeeding as an NFL quarterback is a tough, tough job.
Winston comes back for another year and shows he's grown up a bit? Okay, maybe I'm a little more interested.
Sophomore QB with character issues?? I'm a bit worried on that one.