I've been reading about PE for 4 years plus, and it's the soundest theory I've come across man. The guys who make the most consistent/biggest gains seem to be the ones who are doing some sort of PE all the time, activley or passivley.
Either in the case of someone like bib who was hanging hours and hours a day, or memento the mod on thunders who was doing a 2 x day v stretch/jelq split and said he got 2" in 6 months. Monty got 2" in a year wearing heavy golf weights and heavy hanging. My point being is that their dicks were never allowed to into a state of shortened healing for very long.
Then you have guys who make great gains for like 6 months, then everything comes to a standstill if they don't use an ADS etc.
Also, I have read about people wearing TLC tugger gaining an inch, without PE. Obviously over a long period of time.