That's definitely not it.
The Jazz just have ****** man defenders who also aren't high IQ defenders. Plus guys like Mitchell aren't living up to their defensive potential.
I mean, they added guys like Bogey, Clarkson, Mudiay, and Bradley (I know he wasn't "added" but it's his first time actually playing). Plus Niang is getting more minutes and Ingles/Conley have aged on the defensive end.
And Oneale is an overrated defender (by some). He isn't a game changer on that end or a lockdown guy. He is merely a good defender. And he honestly might be the only good defender on the team outside of Rudy (I'd call Ingles, Conley, and Mitchell average).
Juwan Morgan has some defensive potential, but it does seem likes he's too small to play center and it's hard to play him over Niang, who does a great job at playing in Utah offense with his spacing and at least knows where to be (Morgan often looks lost).
I really wish Oni could get some run as he has the body and athleticism to be a plus defender, but his gleague stats don't suggest that he is ready.