My two cousins weight in about 225 and the other one around 235 in high school. Both at around 6'2-6'3. Went on to both play DI-A football. Got to well over 500+ in the bench, while in college and weighted about 255 to 265 each their last year. Both were linemen. looked fairly trim in high school because of their large bone structure and having wide bodies. They also didn't like hitting the weight room that much, just did it as a matter of team training and protocol. The don't lift now.
Don't know if Viator used or not as a teenager, have no information to confirm this so don't want to spread false rumors. The actually point is that Mike C reminds me of Viator (druggie or not). At 18 he hasn't reached near his full potential in muscle size and strength.
They are probably reacting to his strength first, because 400 might seem almost impossible for some of the critic's. Maybe a lot of them can't even squat or Dl with that much, I don't know. I can understand with all the drug use today, BB'ing has become very cynical, and for good reason. And like I said above, he's only 18 so not even approaching is peak physical condition for BB'ing. The fact still remains, there are natural born strength athletes, though perhaps somewhat rare. Good Luck.