Stipe fought in 7 years:
Hunt, Arlovski, Werdum, Overeem, JDS 2x, Ngannou 2x, Cormier 3x
Fedor fought in 7 years:
Schilt, Herring, Nogueira 3x, Coleman (1 loss removed from beeing champion), Randleman (beat top ranked CC), Cro Cop, Hunt, Sylvia, Arlovski
If you look at it like that, then Fedor...