Chuck has been getting clipped in fights and going down. Rampage and Rua. He was knocked out for a long time by Evans. The more his chin gets touched, the easier it is for the lights to go out. Add his age to that equation and it doesn't look good for Chuck, who was once regarded as having an iron chin earlier in his career.
The same thing is showing with Randy. To a lesser degree this holds true with Rich as well.
I am afraid that if Rich and Chuck are in the clinch and one of them sneezes hard, the fight could be over. I definately see knockout or very boring stand up because they respect each other too much. First one to land wins. I got my money on Chuck!