Mavs fan out there, did you watch the recent interview with Kristap Porzingis?
Look at his built. I've noticed that his body becomes more bulk up. Damn, what did he do while out on NBA (aside from involving into a brawl lol)? Like he isn't came from an injury.
Maybe others will see it as a disadvantage since he might become slow but for me, he will be like an athletic version of Dirk Nowitzki.
Perhaps he is getting his body in shape this season specially if he is going more on the paint rather than shooting outside. So bulking up is the logical choice here.
Definitely he can be slower, but I don't think that it will affect his shooting hands though. He could literally practicing thousands of shots per day with his new frame and see how it goes for him.