I really haven't thought that much about it. But yes, I believe that a player is capable of improving with practice. Not saying he will. I just think that the way he handles the ball is a lot like Parker, who is also not a good shooter, but a very good offensive player.
I always thought Parker was not a very good outside shooter but had a deadly mid range game and drive to the basket game. I could be wrong though and am too lazy to look things up. That being said, even with his offensive deficiencies, Parker is or can be a considered a generational player? No?