I'm with ya, drew.
For #1: You cannot teach everyone to the same quality for two reasons...capacity, and willingness. Capacity: Can't get 20 gallons in a ten gallon bucket. And, as un-PC as it is to say, not everyone is built with the same intelligences. Willingness: The better something works, in general, the more it hurts to train. Not that many soccer mom families out there willing to get down and dirty with the PD, spec-ops, bruisers, etc. So you have to have 2 versions of what you teach: Open door, and closed door. One pays the light bills, the other keeps your interest in the arts for years to come.
2. I forget. I think it was a question about nelson stuff. Mandela, maybe. OK; I got it. The bulk of the nelson techs (take the 3 most common in order to be taught) rely on pain and shock, not mechanical advantage. The second of the two has some mechanical efficacy to it, but #1 and #3 rely on the guy responding to being popped and loosening his grip. What if adrenal dump over-rides pain reception? I'm having a time of it with a new training podnah, ...old SEAL, feels no pain. The way he knows he's standing in a fire is by the smell of his cooking feet. So pain compliance techs are out. Luckily, Doc has provided nelson solutions that are structurally based, and break down the integrity of the bad guy while shoring up your own, and allow you some better "how to" to break the hold.
Banging in drills with an old spook who doesn't feel owie's is a treat, but requires a willingness to get beat up along the way yourself; he may not feel pain, but knows when his melon's been shaken, and is quick to return the favor. Each session ends with me hobbling home, bruised like a mammy-jammer. I'm diggin it, and will keep showing up to train until I can't, because of that whole "weakness leaving the body" thang. Nights in Torrance on the SL-4 mat are akin to 40 to 60 low-speed car accidents each session -- having your skeleton rattled around by techs that target structural penetration, with you being the one getting hit. All night, several nights a week, Docs guys show up to ring each others melons in a quest for mastering what works. Not many out there are going to choose to capitalize on an opportunity to train in pain; to get home late to a handful of advil. This, principally, is why you cannot teach everybody to the same standard. Capacity, and Willingness.
Be good,
Dr. Dave