KO has shown nothing yet and he's on the verge of being a complete bust.
I'm curious what your reasoning is for this, given that he's been above-average productive in both of his first two seasons, and stats generally indicate that the team is at the very least not hurt by his presence on the court.
He may not have much of a ceiling, but KO has definitely shown, I think, that's he's a rotation-caliber NBA player. Yes, he requires the right fit given his defensive limitations. He wouldn't get playing time on every single team in the league. But it's hard to call him a bust given where he was drafted.
Kelly's not as exciting as a few of the guys taken after him, but you can't blame him for the fact that Danny Ainge reached on a safe pick.