Wow, Spyder, that is the most understandable explanation I've ever heard--it clears up so much-- like WHY the more-or-less position helps a green horse (which I have trouble thinking will do a correct haunches-in) get his lead; and the problem of "falling-in."
HalfPass, in my case it's all about Going Foreward. My horse does her best half-pass when we're out on the roads. Nothing goes well until I can get her moving out. Right now that's our biggest issue.