You are so misguided. Cardio is incredibly important for boxing, wrestling and mma. Running out of gas is a major problem in the fighting arts. Just as Mariusz illustrated in the Sylvia fight. Sylvia is a shot fighter. Mariusz was never a factor in that fight and he lost. A Power lifter with a little MMA will be a factor in fights is just day dreaming. Most twink MMA guys with cardio will tap out powerlifters weighing a lot more than them. My advice to you is start rolling on the mats with jui jitsu guys and then come up with an opinion.
The point is a big stronger powerlifter kind of guy can go into a mma gym and with a little bit of training beat the shit out of guys who have being training for much longer, strength is important in a fight, a submission move like a kimura a strong guy can tap you with it even if he does not have the technique down 100 percent.