Just earlier today, Andy Ruiz Jr proved that body shape isn't all that important in the greater scheme of things. Berto has always been pretty ripped but its not body-building, its boxing.
And some respond better to training, dieting, etc. That's just superior genetics and would be no different if everyone was using steroids.
No it wouldn't you idiot. Some guys can buy the usual sh!t at a gym, the richer guys can pay a personal doctor a million dollars a year salary. Take a wild guess who has the extreme advantage ?