Agree Fedor hands down! I personally like Chuck as a fighter, but I don't think he belongs in this list. And Royce he had excellent stamina, and came at a time where no one understood how to fight him. Do I think he belongs on a list of the greatest of all time, no. A game changer for sure. I see the greatest of all time to be those that have reached a level of performance in other than just one discipline.
Greatest knockout punchers, greatest wrestlers, greatest submissions , some of them one sided, but not worthy of the greatest of MMA. However when you talk about Fedor, George and Anderson the spider, Bj Penn, as well as a few not on this current list, belong in a league of their own when speaking of greatest MMA Fighters.