This is so wrong on so many levels.
1) He has absolutely no guarantee of being drafted. Late first round picks, especially with major questions about their size, have a way of dropping like stones on draft day. Also, Manny Harris,
2) I guaranetee he's doing the usual dumb athlete routine of listening to his hangers-on instead of a reliable source for his draft position. The general public is probably much more realistic about his draft prospects.
3) A monster NCAA tourney can do wonders to boost a player's resume. NBA GM's are people after all, and like everyone else they are prone to favor players who have been playing well recently. Stephen Curry anyone?
4) He's not even good enough to outplay Aaron Craft. What on Earth would convince him that he'd be better against a higher level of competition?