Toppin can't defend the 3.
Offensively, his handle is solid for a 4 but would be exposed on the wing. As I said, he was heavily featured as a roll/pop man at Dayton. There's not much evidence to suggest he can play on the wing on either end.
He reminds me a lot of John Collins, but I'm not sure he'll rebound as well as Collins does.
Just here to point out that Toppin and Collins are both 22, and Collins is putting up bigger numbers in the NBA than Toppin is in the A-10...