Second, we all know KG, Kobe, Jermaine, and T-Mac were pioneers in the modern age of drafting of high schoolers. Teams didn't know what to expect, and felt it was too much of a risk at that time. But put those guys into drafts in the 2000s, they're all #1 or #2 picks. So that doesn't matter either.
It's like if a team had Kobe, and he was only putting up 7 points, and finishing off the year with 4 straight airballs against the Jazz in a playoff game, are they gonna say, "yep, I knew it, this kid ain't cut out for the league"? No, you give them a chance to see what they can do, especially if they show flashes and have a great work ethic.
How do we know if we can bail on a player quickly? Its all about attitude and work ethic. Sean May was destined to bust because he'd rather party downtown and drink than work on getting fit and practicing his moves. Morrison wasn't cut out for it because he didn't have the mentality to handle tough pressure. He crumbled when given the chance, not just here, but in other stops as well. MKG is tough minded and lives in the gym, so I don't think we can write him off until the end of his rookie contract.