That or he just got some experience and jopat is a narcissist. It's hard to choose which is more likely. Capela's issue was never being slow, unlike Jones, when he went on instinct, he responded quickly, it was about experience and not being over zealous, ie developing enough muscle memory and experience so that he wouldn't foul everything, wouldn't goal tend half his shot blocks as he would second guess himself a lot and hold back to "not screw up".
Clint could become the best center in the league and still be a few light years away. Capela is absolutely amazing though.