I'll admit that I haven't read through this entire topic, that's just too much for me.
I just wanted to put my two cents in.
The OP sounds like a lovely horsewoman and I definitely respect that. Personally I can't stand Parelli, but I don't argue with results (that involve fair, respectful handling of a horse and achieving what is set out to be done without excessive force) and when it works for somebody I think that's great. However, I have found that about 95% of the Parelli people I have encountered (and mind you I board at an NH-based barn with emphasis on Parelli) did not know how to properly handle a horse that was displaying dangerous behaviour of any kind, could not comfortably ride a horse that was not previously dead broke, were regularly not just scared but seemingly terrified of their own horses, and could not even think to set goals for themselves or their horses because they were never able to a achieve them, all while claiming to be better able to bond with a horse than the average horseperson. Supposedly what they do is supposed to be softer and gentler and easier to understand than other methods of training, but I have very often seen sloppy, messy-looking and often harsh displays I could not understand even with step-by-step instruction, and what I'm describing was the people at higher levels who were trained and very familiar with the method. I find that all extremely unfortunate.
The remaining 5% have seemed to be very successful in what they set out to do and handled a wide range of horses with at least reasonable confidence. The common theme there was a pretty unanimous agreement that the newer material is a lot of BS and oftentimes they incorporated other training methods into their horsemanship at least on some level. I have nothing to say against that at all, I can completely respect that.
I often find it confusing, however, that it's seemingly such a common thought among Parelli followers that there are only two methods of horsemanship: Parelli and traditional. Then I often find that that concept of "traditional" horsemanship is a bit warped on top of that.
As a self proclaimed anti-Parellite, I personally train in a manner that can only be described as natural horsemanship as it is almost completely derived completely from studying the way horses think and behave and communicating with them in ways that make clear sense to them quickly if not immediately, following that way of thinking, as well as a lot of good old hands-on trial and error to figure out what each individual horse responds best to. I'm not sure it can get more natural than that as long as you're still a predator strapping a saddle to a prey animal's back and asking him to carry you around on it.