Rahman told FightHype.com that if he fights Kimbo, "I see him getting knocked out quick. ... Kimbo would get knocked out trying to take me to the ground."
I'm sure Rahman is right that he'd knock Kimbo out, but that's because (as Seth Petruzelli showed), it's easy to knock Kimbo out. Any halfway decent heavyweight boxer should be able to knock Kimbo out quickly. That doesn't mean he'd be any good at MMA.