...the multiple factors are exactly why I wouldn't recommend Tenchinage as a very beginning case study...
My sentiments exactly... there is already so much going on in "simple" bi-directional training exercises that you don't need the added complexities, certainly not in an initial case study, and especially not as a training product test in the early stages. Any such testing would be pointless and pretty much inconclusive, other than to confirm what you and probably everyone else already knows.... that you s... er... still have a lot of work to do.
And since the topic title is about kokyu development for aiki in Aikido, why not stick to the really basic stuff, like... er... kokyu-ho instead? I mean, isn't that the entire point of kokyu-ho; for kokyu development? Or am I missing the context because I wasn't at the seminar?