Unless he takes nothing he has in college into the NBA he is better than Wally or Korver are right now, without having played a game in the NBA.
He will never be Bird good. Never. But he should be better than the other 2 as a rookie. Wally is a cancer and an awful basketball player, without even mentioning the contract. Korver can chuck. Thats it. Good for a hustle play or 2 a game, but that really is it.
Morrison should be a second tier swingman, with guys like Hamilton, Redd and others. Not a 5th or 6th tier like the guys you named. Morrison is more athletic than people give him credit for and he is super skillful and one of the smartest players to come out of college, ever.