It’s just like any other sport. Should legacy be determined by skill or by era? Fedor is the ultimate MMA test for that question. Compared to other HWs at the time, there’s never been as big a gap between 1 & 2 as there was between Fedor and guys at the time like Randy, Mir, Nog, etc.. In that way, he’s the Michael Jordan of heavyweight MMA.
But I think most people are wrong when they start talking about what “Prime Fedor” would do in the modern day. There’s no version of Fedor that beats guys like Ngannou & Stipe. Sergei Pavlovich would eat Fedor alive.