randleman is like 50 lbs lighter than brock, and although brock is technically a green wrestler making a transition, he completely dominated a legitamate journeyman fighter, and before the knee bar out of no where was about to stop a former ufc champ, now they are not on randy's level, but i dont believe brock is getting enough credit, as far as the chin is concerned, hes got huge legs, shoulders, neck and a strong jaw line, i think he'll be able to take at the very least a couple shots from a much smaller fighter in randy and tie him up if he gets tagged, remember couture isnt known for his strinking power, that right hand he landed on sylvia will probably be the hardest punch he has ever landed and ever will land in a fight, if anything id say that right hand that sent heath herring flying across the cage should worry randy more as he has had his lights put out twice at lhw and been finished a couple times at hw (not taking away from his good chin though)
he's got a pretty good ground game actually, not better than Randy technically and probably not better despite the size advantage, but if he manages to get on top of Randy, he will do quite well for himself.