"Here is an example of big man absolutely demolishing best kick boxer ever:"
LOL at this attempt to be scientific or academic. You are cherry picking evidence to try to support your very questionable claim.
A few other thoughts:
This is a troll post.
Sapp likely would have crushed nog if knees and stops were allowed.
Sapp destroyed many smaller grapplers.
Mirko and Bonjasky wrecked Sapp.
Hoost isn't the best kick boxer ever and the fact that you think so shows how limited your knowledge about striking is.
Rickson's inability to submit (or do anything to) Mark Schultz who although bigger and very athletic knew nothing of submission when they rolled.
Kaoklai: http://www.youtube.com/watch?v=znooRXwni6o
http://www.youtube.com/watch?v=2woExNPTYso
http://www.youtube.com/watch?v=19T_V3u0GUY
He is the guy who knocked (the bigger) Denis Kang right the fuck out.
Modern mma rules heavily favor grapplers. No head buts, no eye gouging, no groin attacks (which Big Daddy proved to be highly effective on the ground), no kneeing the head after a failed BJJ style shot (ie duck your head and run at the guys legs with both arms extended), no kicking or stomping the head of a downed opponent, yet a guy on his back can up kick, no holding the cage John Lewis showed how effective cage grabbing can be, also cage grabbing allowed Chuck Liddell to retain his title for so long, no grabbing of the hair (this technique allowed Warring to dominate skilled grappler Eric Paulson), so biting, fish hooking, small joint munipulations. No striking to the back of the head. Frank S. showed a well placed strike to the back of the head on the ground can damn near kill a man. Most MMA rules are there to protect grapplers and force guys to play their game. TDs that do no damage are heavily rewarded by the judges.
Now to be a bit more serious, the fact is that be it striking or grappling, skill can overcome size. The larger the gap in size ther larger the gap in skill needs to be. I've seen big athletic guys embarass grapplers and strikers.
If you are so convinced of your theory I know a 135 lbs Thai guy who will spar with you so you can demonstrate the veracity of your claim to the world. Since you are bigger you should be able to do just fine in some friendly sparring, right?
"The truth is nafarious."
Actaully it is N-E-F-A-R-I-O-U-S.