Where guys like Cain fought the same guy, once a year... Fedor fought a couple of tough guys a year and kept sharp by fighting cans in between. However, we DID NOT KNOW they were cans until Fedor destroyed them. Zulu and Choi were giants and wouldn't even be allowed to compete in the UFC and both were undefeated, albeit 2-0, before stepping in the ring with Fedor. A 350lb "can" can do a whole hell of a lot of damage if he hits you, as you've got your UFC goats, like GSP, getting slaughtered by a "can" like Serra in his prime (no disrespect to Serra as he was able to win a World Title in a higher weightclass than he belonged), Anderson Silva getting heel hooked by some random can and the UFC HW champ is about to break the title defense record that is a WHOPPING 2 WINS. 10 years / 30+ fights at heavyweight? Well, there you have it. With all of these "goats" falling left and right, I think Fedor CAN be called the GOAT, easily.