Remember when Brock Lesnar was thought to be invincible, and then when Cain beat him, he was going to dominate the HW division for years? JDS is a great fighter, and I favor him against Cain, but with Cain, Overeem, Cormier, and JDS in the HW division no man will be able to defeat all the rest. Heavyweights are too powerful and there are too many KO's. Things will get even more competitive once Jon Jones moves up. Fedor was a great fighter, but he wouldn't have gone undefeated against Lesnar, Couture, Overeem, and Mir. Prime Fedor couldn't go undefeated against the best HW in the UFC right now; no man can. Now fanboys will say that their favorite fighter is invincible and will dominate all the others, but these guys are just too good to get dominated by any one man.