For the record, its not even about who Fedor beat. It was more his style, his sambo and incredible striking. Killer instinct.. submissions off his back. He had it all, and was extremely dangerous at any moment during the fight.
The biggest difference is Fedor, compared to GSP.. he could finish anyone in the world in the first round. And usually did. Compared to Anderson, Fedor was strong enough to avoid being thrown around or beat in any department. Even if he got takedown, he always reversed the situation, where as Anderson has lost fights on the ground in the past, and lost rounds in the UFC being completely controlled. I know he did poorly in the later of his career, he got fat and didn't have the right fighting mindset anymore.