Disco, your comments about Brock being too big are amusing. He has dropped 20-30lbs to be able to compete. If anything, he's far smaller and faster than he's been since probably his freshman year in university. As for his conditioning, Brock has always been known as a cardio monster. There are middleweights that could learn a thing or two from him (I think we all know who those guys are).
Brock is also shocking fast and agile. Not for his size, for any man's size. Look at his two fights and see how quick his takedowns are. Nobody shoots like that. And as for his agility, this is a man who at near 300lbs used to do a shooting star press as his finishing move in wrestling. I know, I'm probably opening a can of worms there but unless you've seen it you can't know how impressive it is to see a man that big move his body with so much grace and, yes, flexibility. He may or may not succeed in MMA but his physique, conditioning, flexibility, and agility are all a plus for him