Bigfoot beats Mir. Mir probably won't be able to get powerful submissions like a kimura in because Bigfoot is so heavy on top of you and it would be so hard to control his arms like that. He might hit with a triangle but that was never his style. A guillotine isnt out of the question either, but this is all if Bigfoot decides to go to the ground (where he is a very talented BJJ fighter), but he'll probably keep it standing. He'd out power Mir against the cage so the Cro Cop performance is out of the question and I think he'd have too much power for Mir to withstand on the feet. Mir would have to pull guard and pull something off as he does.