If he were to play against the bigger stronger players in the league, he'd get dominated. He has no offense other than to drop the ball in the hoop, an opportunity he wouldn't get often if playing against legit NBA centers, and he's a terrible FT shooter so there's always an easy out for the opponent. He's too slow to set screens, gets dusted if he has to switch on D, and isn't making anything outside of 5 ft.
He's just not an NBA player. But with his size and a lower level of competition, I've no doubt he can make a nice living in Europe. He seems like a great guy, I wish for the best for him.