I don't think it's a case of it being painful, it's a case of it affecting his shooting motion. He was out there shooting after the game to see what he needs to change to get his shot to drop, because he has to account for this -Here's the problem though, they're not giving him treatment for his elbow and he's not icing it either, if it were truly painful right now he wouldn't be shooting as much and he'd be getting treatment on it.
He was injured sure, and that may have changed his form over time, but right now it looks more mental than anything else. He was out there shooting after the game in their practice gym, and again in the arena after the game, that is a confidence issue now.