Selfish and locker room cancer? That's not true, but if it were, it would probably only help him fit in at the next level. Oscar was a worse defender than Dickinson and spent four years in college. Are you saying the NPOY wasn't that good?
Not getting into it again, but history shows that those teams have a good chance of going far, even when coached by Calipari. Much higher chance than your average team of upperclassmen.
By your logic, no junior or senior gets to be a star. There's a reason they're still in college, right?