Gilbert Burns wants a rematch with Khamzat Chimaev! TMZ Sports talked to 35-year-old Burns -- the first time the UFC star has broken his silence since leaving the Octagon after losing a 3-round decision at UFC 273 -- and chopped it up about everything from a rematch, what it was fighting Khamzat, to how Chimaev would fare against champ Kamaru Usman (Burns is the only person to face both).