Re: Using Ki. Ki-atsu.
We do the same in Seidokan Aikido. R. Kobayashi learned from Tohei directly as well as others. I've not seen anything about dislocations, but for any variety of things I've seen it done and been taught it in a manner consistent with Mr. Ellis. Had a session done on my aching back yesterday as a matter of fact. The science background in me constantly wonders about it, but... I cannot argue with the anecdotal aspect, especially when it's my anecdote about it working for me.
I sometimes deal with patella subluxation (one kneecap likes to spontaneously dislocate). Had it happen a couple times in class and one of our seniors has been there on a few occasions. On those occasions with only about 10 minutes of work I've been vastly better than other occasions when he wasn't there. So... Cool stuff. Interesting stuff.