First of all, Dana White is gay.
Well, ok, maybe he is not gay. What I don't like about him is his arrogance which to me is the obvious reason why Fedor wouldn't fight for him.
I definitely wouldn't go as far as to claim that UFC has the best fighters in the world in every category.
What I like about him and the UFC is that they don't protect their fighters. They just make the fights happen. If Dana had Haye and Klitschkos signed he would just make them fight each other until both of the K's would get their "KO of the night bonuses". Then he would force the bros to fight each other . He would perhaps keep Haye for two more fights with able opponents, after which he would probably be fired.
And Mayweather wouldn't behave like arrogant pig either cause UFC paychecks are ridiculously low