Shaq is a backup, at best. He'll probably see spot minutes starting if there is an injury but he lacked the ability to feed the ball into Ayton during Summer League, which is a problem. He's only played with 1 or 2 other scorers at a time and has no experience with a team with 3 guys who can knock down 3's and a lowpost option as well. We'll see what he can do but I won't hold my breath. There is a reason he was in the G-League and made his NBA debut last season. He's not a good 3pt shooter, not that good at driving to score, has trouble making entry passes inside, and has only been guarding backups and fringe NBA players.
I would be pleasantly surprised if he can shoot better than 35% from 3 and keeps an assist to turnover ratio better than a 1.5. If he starts, I think he'll struggle to even get 10 points on his own. He won't need to be a scorer but since he's not a good facilitator he needs to give us something on offense but I don't see what that might be right now.