I don't think he should worry about it too much. I never noticed it till it was pointed out in this thread.
You didn't watch the Olympia, then, did you? McCarver had the worst midsection on stage by a country mile. Absolutely shit back, too. Face it, brother, he's a shit-tier bodybuilder, and he's not going to go anywhere. If you're a friend of his, you should give him some advice: Get into powerlifting or strongman, bodybuilding is slow suicide and there won't be a payoff.