Say what you will about him, but Israel is the only guy who truly cleaned out a division. No other champ had wins over all of the top 5 contenders whereas Izzy had beat Whittaker 2X, Cannonier, Vettori, Brunson, and Costa (the current #s 2-6).
Also wins over Romero and Gastellum when they were top 5.
Compare this to Usman who has wins over 3 guys surrently ranked in the top-15 (2X Colby, 2X Masvidal lol, Burns).