#1 Dan Henderson
Forget Vitor Belfort and forget some of his recent losses. Dan "Hendo" Henderson is one of the baddest dudes on the planet and has been for well over a decade now. His knockout power combined with the fact that his chin was formerly made from iron makes him one scary individual - kind of like another undead figure, some would say.
He may not have become a champion in the UFC but in the grand scheme of his career, that isn't nearly as important as his overall legacy. The guy has maintained his stature as one of the best in the world throughout a number of different eras, and now that he's retired from the game mixed martial arts will never be the same.
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We'll miss you, Dan.