Re: bokken suburi questions
I dip in and out of Aikiweb and due to the way forums are marked as read, I don't always notice that responses have been made to threads in which I have participated - so rather belatedly:
Inaba sensei has documented his version of the story, but so far in a version not issued to more than a few hundred students. As and when it becomes public it may answer some of the points above, including as it does quotes from correspondence from Kunii sensei.
Interestingly I believe that Kunii sensei's daughter was present at the ceremony to mark the 35th anniversary of the Shiseikan...