There's only one or two "stars" on each team, so not every draft pick is meant to be a hall of famer. Essentially, Kane would need to prove to be better than Lebron, Curry, Durant, Harden, etc. Deandre Kane doesn't cut it as a role player, because he needs the ball in his hands to be effective and has no elite off-ball skills (shooting, defense, rebounding). Marcus Smart was just as good as Kane with the ball in his hands during college, but he gives you elite defense. That's why he's in the NBA and Kane is not.