I agree with everything else you said Duanew, but this does not sound right to me:



Many of these "Americans" were actually encouraged to teach and ended up forming organizations, with the blessing, or at least tacit approval of the Okinawan sensei.

I'm sure some lacked knowledge (in fact it's probably undeniable that the understanding was incomplete at best), but it is definitely not true (as far as I know of course)that Okinawan sensei were "amazed" by their students teaching, and if you go by much of what is available historically many seem to have actually encouraged it.