Ya, in reality it probably has to be some combination of Serra, Holly, Weidman, Randleman. For all the different elements.
Serra would beat GSP maybe 5 times if they fought 100 more times. Douglas would have been 50-50 against Tyson.
Holly beat someone that was not Mike Tyson, especially standing.
Weidman beat an old man, and was only a small underdog at most, and would be a favorite in all future meetings.
Randleman probably has the most parallels. Cro Cop was considered invincible. Randleman was a huge dog. Cro Cop never got back to that level, but did still have success. Randleman himself did not have much more success. And of course..... it happened in Japan.
lol at all the noobs saying Gonzaga btw