MMA's welterweight Mount Rushmore: Ranking Kamaru Usman among the greats

Can Usman ever surpass GSP? He can enhance his legacy as one of the greatest ever with a win on Saturday.

source https://www.espn.com/mma/story/_/id/31298653/ufc-261-mma-welterweight-mount-rushmore-ranking-kamaru-usman-gsp