John Collins
We all knew this was coming, right? John Collins has a lot of upside as a player. He can be very physical when he wants to be, he is dynamic with his offensive skillsets and he can rebound pretty well. Heck, if he were to rework his contract and be ok with 20-24 minutes a game, he'd be the perfect sixth man. But he's not happy with that role it appears, and for that reason, he no longer has a place on this team.
The Utah Jazz can't keep him on the bench to limit his biggest liability, his defense. If he took the bench role, he could be brought in against the second team and work with more defensive-minded guys like Kris Dunn, Walker Kessler, and a few new defensive dynamos who may not be that good on offense. That way Collins can get his reps. After all, he's very good at scoring.
But for as good as he is at scoring the ball, he is worse on defense. You can't justify giving someone like Collins the minutes you do when he's actively a core reason for why you can't stop people on defenses. Sure, he can score 20 points per game, but he can also give up 35.
He's the wrong guy, in the wrong role, on the wrong team. There may be a team that needs what he brings to the table and can cover up his inconsistencies on defense, but the Jazz aren't that team.