Didn't see the game, but the fact he's apparently moving well and unrestricted is a good sign. We all know his talent is far above his draft position given he is healthy. He is a good shooter for a big and is strong in the post.
In my mind there are two things that will determine his career.
1. He is known for being a polished post player, but he has struggled playing against length. In the NBA, everyone is obviously bigger than in college. He's not going to be going against KG or Howard every game, but he's going to be contested with much more length than he did in college which he struggled with. If he adapts and learns how to beat superior length, he will always have that post game to lean on and will be a good bench big no matter what else he does. He already has 3 point/18 foot 2 point range ala KG. If he can win in the post, he will already be a commodity.
2. If he can slim down without losing strength. Right now he's too bulky and will get burned even if he plays near perfect defense. He needs to slim down to gain some lateral quickness. Otherwise someone will pump fake, he'll bite and it'll be an easy dunk and he will be a massive liability. Not only that, but he'll be too slow and bulky to rotate well and protect the rim.