I think the biggest ego pill someone who is about to fight Fedor gets is to see this guy who looks like he just woke up and hasn't trained once in his life in front of them and I bet my life the first thing that goes through their heads is "Holy shit, I'm gonna kill this guy"... only to find out, ten seconds into the fight, that he IS going to beat the shit out of you.
That has to be the biggest morale-killer.