Randy's only hope would be to use the cage to his advantage, get the takedowns and hold Crocop down for 5 rounds... he's not gonna stand up in this one.
I can see where Randy was coming from taking on Sylvia, he saw his limits as a fighter and capitalized on it... unfortunately, Crocop happend to join the UFC at the same time... otherwise we would've seen Randy fight Arlowski or someone like that, where he has a great chance winning.
Either way, I don't think Randy made a mistake coming back, some good money, he's back in the action, got the belt again etc.