Usman probably beats all of them. Colby should probably be next, but I don't think Usman wants to give him that fight, he'd much rather fight someone like Chiesa who will be much easier for him to beat. Assuming Usman vs Colby 2 happens, I see Usman winning, then facing Wonderboy after he beats Burns. Things are gonna suck for Leon Edwards in the meantime. He'll either be sitting out another 2 years, or else he'll need one more win before a title shot. Imo, Wonderboy is the only guy who deserves a title shot right now, and he's already booked against Burns. No one else has enough top wins to justify it. Leon is on a long streak, sure, but a long streak doesn't mean all that much when it isn't against the top guys in the division. Colby is still likely to give Usman the hardest fight out of anyone, but I don't see him doing any better than the first fight, especially not now that Usman's striking seems to be much improved. But who knows, maybe Colby has improved a lot too, hard to tell since we've only seen him fight Woodley.