Another clueless post from you....^
He had no back and giant rear delts because he couldn't activate his back muscles properly, it had nothing to do with " genetics" if you even know what they means....
Genetics is a broadly used term here. Encompasses a variety of things, but in this situation it was limitations of the shape/size of his back.
And what prevented him from "activating" his back muscles, yet enabled him to activate all of the other ones?
Explain how increased "drive and determination" would have made him unbeatable, which is the entire context of the discussion.
Or don't, I couldn't give a fuck.