I’m sure JJ shows well in practice. Which is why Joeger continues to give him minutes.
JJ has the ability and skill to be a good role player. He shows flashes every once in a while.
What he needs is to have his role defined and he needs to come off the bench. When he is in with the starters, he becomes timid. I think if he comes off the bench and is the top 1 or 2 option with his unit, he would have more confidence and aggressivness. He also needs to get a lot stronger to battle with the big boys.
Give him some time though, he may take 3-4 years to really show what he really has, like WCS did.