When I used to read Mike Sigman discussing jin/kokyu and it matched my image of sandan in aikido - because it was about mind/body unification. Since training internals a bit, I believe it is probably much more in line with what my opinion of yondan in aikido SHOULD BE - that your mind and body do different things at the same time (separated) to accomplish things (where sandan is mind/body unified). I got my yondan and was completely intimidated by how much work - and how much time it was going to take - that I was going to have to do to be able to really manifest this. Now I am studying internal skills directly - I am still intimidated by how much work and time it will take - but it is CLEARLY going to get me further faster. (It already has, and I haven't really got started yet..) And I'll take any help I can get.
I don't think it matters much what I said/say, to be honest. I think that it's all like a fox-hunt... once you spot the fox (or think you have), you're on your own trying to catch that sucker!