Fedor from 2001/2002 till 2008 might be the best ever we had in terms of unarmored 1 on 1 combat on this planet.
It's not just the record or the 10 years of W's it's the way he went out there and performed and showed skills in all areas and the type of fight he will dish out, I'll legit favor that version of him vs anyone else you mention to me.
Yea I know all the complains, some cans snuck in there that was the landscape of MMA, he didn't come to the modern UFC yea money / will / Dana whatever the reason his prime era was also closing fast so what exactly is the point if we take a look ? back in the day the best HWs were in Pride and when UFC had the better division Fedor was done in my opinion so what just see the UFC logo and get his ass kicked so some can point and say haha told you so ?
His style (control chaos and going into dangerous spots), his body (MMA fights, Judo / Sambo competitions).
His training (he didn't left his land and went to one of this big evolving camps to change with the time), his own fire changed (how motivated can one be, when you made some coin, got mad respect, mix with the high society of your world).
You can't ask for someone to be at that level for so long it's a shooting star in our MMA world you can't operate at that level for to much time doing what he has done and keep in mind he also ain't the most psychical imposing specimen out there either.
Also I don't expect some millennials to understand all this, you can't truly appreciate him just for some highlights and having this old timer sherdogers keep telling you how good it was back in the day over and over again.