One factor working against him is playing time. He's not likely to get much. It is hard to improve without real game action and I don't see him getting more than a few mpg. He looks to be the 12th or maybe even the 13th man on the roster next year. When is he going to play?
You raise an important point, though it works both ways, doesn’t it? - i.e., you also get floor time for playing well.
He may have to bide his time and play irregular minutes early in the season, but it’s also likely that injuries will open up an opportunity for him later on. His main competition is for swing minutes, meaning mainly Tatum and Morris; if Baynes doesn’t return we might not see as many two-big lineups, which would give him some opportunities.
Then, too, he’s a gifted defender, with superb anticipation, lower body strength, spring, and laterals. That’s, in the end, what his playing time hinges on.