One more thing: I've heard it said that Aikido is a path whereas Aiki-Jujutsu is a set of techniques but both Hakko Ryu and Kokodo are conscientiously humanitarian in their application of Jujutsu and incorporate Shiatsu healing, which I believe is a requirement for all Shihans. So is the difference more superficial than has been made out? I think Hakko Ryu would consider itself a Budo the same as Aikido.
It might interest you to know that Okyuama wasn't a legitimate Shiatsu practitioner. He never had proper training. However, Irie-Sensei went to school and is a licensed Shiatsu practitioner. Hobbs-Sensei learned Shiatsu through his Kokodo Jujutsu training. I think it is more accurate to say that legitimate Shiatsu training is a part of Kokodo.