Well, it would not be a stretch to think Justin Upton has as much a shot as any prospect at winning an MVP some day.
Anyway, I don't know about you guys, but seems to me that most players who are MVP caliber (now and past) didn't play any college ball. To me, if you're gonna say it's silly to predict that any HS prospect might eventually win an MVP, then you might as well just say it's silly to predict ANY prospect for that period.
I'm guessing the OP was just asking who has the kind of achievable upside for a good shot at an MVP some day -- not necessarily that he will actually win an MVP. I guess you guys would not have suggested ARod or Junior or various others to eventually become MVP caliber players when they were still prospects.
Just another amateur learning to paint w/ "the light of the world".