If he is successful it will be as a stretch 4. Otherwise he'll end up like Earl Clark, Aminu, and Thad Young (this actually wouldn't be that bad).
I'm fine with him at 12 but have little hope he is a 3 and D wing guy. I didn't like him when we were in the 6-8 range because I thought other guys were better prospects. I think his worst case is a Udonis Haslem lunch pail type of backup big. Best case he is a better shooting/longer Thad young. Probably less ball skills though.
He has shown a way better jumper than any of those 3 players.