Charles David Henderson
It is interesting to read, however, him expressing his dissatisfaction with his early training in terms of the limits of "one-on-one combat forms." What do you think he found limiting? The lack of multiple attacker-forms; the forms themselves ...?
Maybe what O'Sensei found disatisfying was the lack of spontanuality in techniques. Too much kata, too much form, too much thinking. Not enough formlessness.
True Budo should be formless & spontaneous.