Which is what I said, earlier, regarding Yi-Chi-Li (but I seem to be under the Curse of Apollo...
). Yi (Shin) drives Chi (Ki)... which drives the body and the outward expression of physical power and waza. Kokyu assists in the creation of spherical force ("peng") by providing a little boost to the change in atmospheric pressure in body cavities, until the individual is able to use other means to create the structural force by other means (manipulating internal tissues instead of depending on kokyu).
And which is also what I said! I was hoping to get some confirmation from someone like Gleason sensei but didn't think it would happen in this thread. I don't know Cady or Gleason sensei, but apparently there is synchrony in our understandings.
ps Cady, "Chi" is "to eat" and "qi" is ki... well without tone markers things aren't specific, but that's one way to look at it. (I know it sounds smartassy but inaccuracies can snowball so it's easier to point it out even when it seems to not matter much)