Klay's ability to get open and hit a shot with a lighting quick release with his feet/chest facing away from the basket when he jumps is how he creates.
Reddick and Korver possessed that skill as will.
That's not typically what you want in a closer, but when you can run a set like that and make the defense scramble to make sure he doesn't get open, it opens up the floor for everyone else.

Can Trey get to that level? Maybe, and that's an awesome thing to have in your back pocket in late game situations. I'm not sure Trey's release is quick enough just yet, but his ability to find that space by shooting from distance and being so tall without a doubt helps him. And he's learning how to relocate when run off the line, whether with the ball or not.

And no Zion isn't at Jokic's level, but he has the potential to get near there. Same as Giannis. But both Jokic and Giannis relied very heavily on Murray and Middleton's ability to hit clutch mid range shots late in games. I know you all hate that shot, but seriously, watch how often it's attempted late in playoff games. It's the one shot you can't take away from an offensive guy. You can stop him from shooting a 3. You can stop him from getting to the rim, or at least make that extremely difficult. But you can't stop a guy from taking 2 dribbles and rising up from 18' out. You can be in his face all you want, but he'll get that shot off.
BI has irritated all of us, but he's still the one guy on this team that can do that and win us games. the problem is he simply doesn't make the shot more often than not it seems, and we aren't winning close games.
No one would be upset with his shot selection if he had won us a few games this year hitting some clutch shots. Well.....he still needs to take 2 more 3's a game, but him being more clutch is probably more important to us getting to where we want to be than him just shooting more 3's. He has to be our secondary closer, and if he can't be that, then we need a new guy that can be.