I understood the the reason Werdum gave for Fedor's loss...his impatience. However, you inability to comprehend is the issue here, so I will repeat. Regardless of the reason for the loss, IT'S STILL A LOSS. Who gives a shit who has the most skills, or whatever. It's a fight. And, Fedor tapped for mercy. There's no way out of that.
And, Fedor knows he would be utterly dominated in the UFC. Guys like JDS, Cain, Carwin, Lesnar and yes, even Mir, would have him for lunch. No world class BJJ needed to do it either.
BTW, here's something for you to ponder, since you brought up Mir. IMO, what made Fedor great for his time, were his wins over Nog & CroCop...that's it. Those are his biggest wins. Guess what, Mir has demolished them both...ha ha ha!
Mir > Fedor