I've been thinking for quite some time that most of the stuff that's "legit" is just an average (working for most people to some level), while many different things can work differently for different people, given their metabolism, hormone level, CNS, etc, etc...
T.Freeman (yes, he's on hormones, but whatever) is training very ligh most of the time, yet is a beast, while some are on the same hormones, train like beasts, but doesn't come close.