Zigg-
I believe you are correct. The theory goes that no matter what the angle you hang at, the tunica receives stretch. But it also posits that if the ligs are taking stress, and there is no room left in the ligs for “growth”, the inner penis - that part of your unit behind the ligs and within the body - is not being affected by the tension. It is, in essence, simply sitting there slack, and some argue that by stressing the entire penis - inside and out - you optimize your effectiveness, and the only route to this is via upper angles.
Personally, I have never bothered with this - mostly because according to the LOT Theory I have plenty of room left for lig gains, but also because lower angle hanging is less complicated, and as you noted there is still stress being applied to the shaft.
I have also run into a few bouts of temporary numbness using OTS. Never with BTC.
HaHa-
That’s what I have heard too. Hobby first proposed the idea that one’s LOT might “rise” through hanging at upper angles. A search might bring up some thoughts on the matter.