I also dont think he's that much of an upgrade over NIang. He's having a terrible year and he's worse at perimeter D than Niang. He does have size though, so he can contribute more to rebounding. Utah is currently #1 in team rebounding percentage though, so it's not really a thing the Jazz should be worried about.
So like I said in the last post, 0% chance of happening. The Jazz can't afford it with assets or $$$ cost and it's not a move that helps the team in any significant way, even if Bjelica comes over and plays like he did last year.