To my very superficial understanding of his game, I could see this working a bit. We're actually quite thin at the 5 if we're considering that Withey doesn't get much burn. Assuming Gobert and Favors are healthy, more lineups can obviously have Favors as the default 5 when Gobert is not on the floor. I think we could likely see Bolomboy as a five in certain lineups if there's any injury to Gobert or Favors. On offense, based on the structure of our team having a lot of passing and now improved perimeter shooting, his athleticism may bring him some easy buckets within the offense and wouldn't be much of a liability while at the same time not having to be relied on for any production. There really aren't many big 5s that a lot of teams will run with and I think the biggest thing he brings is being able to be athletic enough to run with the team (and against other smaller big men) but also being a legitimate rebounder (which I think would be his largest value as he will bring that to the table without sacrificing speed or athleticism [simething more typical of someone who may be a good rebounder]). This can exploit other teams who try to put out quicker bigs who are weaker rebounders.
In other words he goes out there and wreaks havoc. The Jazz need some of that. Now that Booker is gone we could probably use a havoc wreaker.