You can improve on defense. It's a commitment. You have to choose to work your tail off on the defensive end, knowing that you might not have the energy for the offensive end. That's the reality for players that aren't good enough athletically. Not too many players want to do that, because they want to score. It's hard work being a good defender at the P5 level. And it's the kind of hard work that won't show up in the stat sheets.
If I had to guess, I'd say that the arthritis in his one knee makes it difficult to play good defense on the perimeter. I have arthritis in my knee from an ACL replacement/patellar graft and it slowed that knee's ability to react quickly. My only saving grace was that my legs were in extremely good shape when I tore it. And that's pretty minor surgery compared to what Jok had. I couldn't imagine what my knee would be like after having gone as long as he did with his knee shut down, basically. There was a reason why so many college coaches backed off recruiting him. It's tough to come back from that type of knee problem.
