Exactly, the only reason why people will say "he needs more time, etc..." is because that's the way the Wings do things... If the Wings weren't as good/deep of a team or any other team drafted Larkin, there wouldn't be as much talk about him returning to Michigan. I remember reading this past summer that the Wings brass though Nastasiuk had a great prospect camp and such, and they though he could really help their AHL team and benefit from moving to the next level, and were disappointed that the prospect rules forced him back to the OHL when he is ready for the AHL right now. It wouldn't be unprecedented for the Wings to promote a guy this early, they did move Jiri Fischer from the Q to the NHL one year after his draft.
We'll see, but I don't think he is as sure to go back to Michigan as some seem to think. He appears to be ready for the next level in his development. It just depends on what Larkin wants to do... he might really want to stick at Michigan for more than one season. If it were me, I'd probably have a hard time not taking the money and going pro, but if his dream is to compete for the National Championship or something, I wouldn't blame him for wanting to go back, but I could definitely see the Wings wanting him under their own control in the AHL/NHL as soon as next season.