Saturday's boxing match between Paul "The Punisher" Williams against Carlos Quintana looks like a great match-up. I'll post my prognostication later; for now, I'll just speculate over something I found on YouTube.
Don Frye is a professional MMA fighter, and he's the one knocked out in this video. Throwing a punch takes a fraction of a second: one good shot, or in this case, two, can end a fight more quickly than any submission attempt. It's pretty clear that Frye wasn't sucker punched, but he looks drunk, and is obviously not ready to fight. That's the defensive value of surprise. This fight is over before anyone gets a chance to consider piling on, especially in the stupidity-enhancing environment of mass alcohol inebriation.
Grappling is great for challenges and duels, but if you're on the ground, you can't run away from anyone. In general, I wouldn't want to take a fight to the ground if the other guy's friends want to participate. There's no sense getting kicked in the head if retreat is a viable option.