dillet was an unbelievable freak.
also by the way, though I've said this before, while "strength" is important for muscle growth, strength != weight on the bar.
As god says, what's important is stimulating the muscle. If you focus on finding a weight, rep/set scheme, split, etc. that stimulates the muscle the best, you will be much better off than if you simply try to slap weight on the bar constantly.
Focus on good stimulation of all the fibers, and you will be much more successful (and suffer far fewer injuries) than someone who can't sleep unless they got more reps/weight than their last session a la DC. Will you add weight to the bar over time? Sure. But there's no reason to fixate on this one element of lifting.
Design your program with the goal of stimulating the muscle, not with the goal of adding weight to the bar.
If there's any component of muscle growth that is overlooked in the bodybuilding world, it's the role of hormones, not the role of progressive overload. Progressive overload is preached in every magazine, every forum, and every gym worldwide. No one talks about hormones except in shady backwater forums and dimly lit side rooms. If only for the reason that they are the most overlooked aspect of bodybuilding, hormones should be considered the most important.