I found your "reality check" test very interesting and enlightening, at this point I just take you at your word about the muscles & tendons, etc. because I'm not ready to follow that rabbit. But I really want to thank you for digging up that illustrative video, because I love to listen to, and to watch, both those players! That was an awesome recital.
I mentioned in an earlier post how both Brian Sutton and Tony Rice have a pretty impressive control over their fingertips, i.e., control over the proximity of each fingertip to the fretboard while playing. In this example, Brian's fingertips, including the pinky, rarely range far from the fretboard. The pinkie does fly away a bit at some points when not called upon, but not like mine, it flies far away seemingly of it's own accord and sometimes wants to curl below the neck a bit. I've tried each day for nearly a week now to focus on preventing this as much as possible, but it requires a great deal of attention to make a very little headway in this.
Concerning the OP, his question seemed to me to be about keeping the fingertips close to fretting position, rather than the general "use your pinkie to play music." I have been using my pinkie to play music for many years and have no problem with that, it's the resting position of the unused pinkie that gives me trouble. Your points about anatomy are well-taken, but I tend to believe that I can at least improve the resting position of the little finger with practice.
Also, as to the OP's original post, he mentioned a Thile video, and I went back and watched the relevant section of that video (I'd seen the whole thing several times before). What I noticed the past couple years after hearing CT talk about this is: When I watch CT's hands, I find that he himself doesn't do this. His pinkie is often out gathering wool a bit when not in use. Tony Rice and Brian Sutton are better examples in that regard IMO.
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