Saltlover, I think you're underestimating his strength advantage at the next level, as well as the extra space with the deeper 3 point line and the Celtics bigs who can stretch the floor.
He's a mismatch nightmare, and he'll get to the hoop almost at will against NBA guards, using his strength advantage and hyper-aggressive mentality.
He's already used to high minutes, and playing them all with maximum effort as a do it all focal point. He's batttle tested and battle ready.
We also have great depth at guard, so he'll be able to get more rest than he did at OKS.
Again, once you see him standing next to and playing against other guards you think of as strong, you will realize how much stronger he is.
In some ways he's one of the very best athletes in this draft, and in the league, when you factor in his strength and endurance.