Yeah, Monson looks like he should be in the WWE- he is absolutely packed!!
He is also a several time winner of the heavyweight abu-dabi world grappling championships, and a bit of an all round ground fighting Jedi.
He has fought in the UFC, most notably losing a championship challenge against Tim Sylvia.
Not sure why he moved away from UFC, but would suspect that Dana wanted him to fight as aggressively as his image/appearance would suggest, when he is actually a tactician, not a brawler.
Outside fo the ring, he is a true anarchist, in the socio-political sense, and seems to get into all sorts of crazy protests, direct action, and situations of police interest
Plenty of footage of him on youtube- his conditioning workouts are awesome, and he always seems a really nice guy when interviewed or addressing the camera.
As a 'thinking' fighter, with massive physical resources and a highly developed ground game, he stands as good a chance as any against Fedor at the moment, but thats not saying much