Leon Edwards. Was super competitive in the first fight and evolved, improved a lot since then (like Usman). Edwards looked fantastic in his last few fights and i think he might have a real shot in a 5 rounder. His TDD is pretty good and his striking is much better now. I would love to see a rematch. Burns is a good matchup for Usman. I don't see him catching Usman in a submission off his back.
Only way Burns wins is if he catches Usman with a big shot. Then he has a shot at submitting him or polishing him off with more strikes. Otherwise he's getting backed up into the fence and outworked for 5 rounds. The only guy on the roster capable of beating Usman at that kind of game is Covington.
