Out of the division's four only champions, the man currently holding the belt knows who the weakest of them all is.
From Khabib Nurmagomedov and Conor McGregor to Jose Aldo and Stipe Miocic, here are the top 10 fighters with the best salaries.
Jose Aldo insisted that he "wanted to test myself" against Khabib Nurmagomedov in a UFC showdown, but the fight failed to materialise.