Yeah, once buyouts are done, there's no point having an empty roster spot. I just don't think Bhullar is the guy we should give it to.
His quickness issues aren't going to be fixed by any amount of conditioning. His feet are too big and he lacks natural athleticism. He might be effective in a college zone, but he would get carved up defending the pick-and-roll in the pros. For that reason alone, he's always going to be a minus defender at the NBA level.
Realistically, the best chance he's got of making an NBA roster is if he figures out how to use his size to become a dominant offensive player.