Both sides were on display in the championship game. He bamboozled Edey for back to back pick-and-roll dunks, but also committed 5 fouls in 5 minutes.
If he can gain weight and maintain his explosiveness and quick-twitch leaping ability and become a capable fundamentally sound defender in the post, he has a chance to start. If he ends up in between where his quickness and vertical suffer, but he still can't defend opposing bigs, he'll be unplayable. Hopefully at the very least he can be a 15 minute bench big, though that puts a lot of pressure on Reed.