Hello Mr. Pluck,
Though Hakko-ryu does have an historical relationship to aikijujutsu/Daito-ryu, I moved your question to the jujutsu forum instead of the aikijujutsu forum because I think you'll find much more educated responses there. You also might try searching the forum as well, as I'm sure there have already been numerous discussions about Hakko-ryu here.
Regards,