This.
I mean, people, Daniel Orton averaged 13 minutes a game for Kentucky and got drafted in the 1st round (29th Overall).
7 foot centers are never ready for the NBA. Because they get paid. Who was the last 7 footer that got drafted that had an instant impact?
If your a 1st round pick, it is NEVER a bad decision to leave early. Everyone likes to cite guys improving their draft statuses, but everyone likes to forget about names like Chris Marcus, Chris Thomas, etc. who didn't declare when the iron was hot and then got derailed by injuries or poor play. The move to come back to college ends up costing those guys millions.