Thank you Daniel. By the way my name is BRAN not Brian.
Actually not that much help in locating the current head, I'm assuming that would be Nakajima Shigeru if the ryu was passed to him making him the 6th head.
I have more questions than I started with now. Wayne Muromoto said, "The Takenouchi Hangan-ryu is an offshoot of the Takenouchi ryu. It split off during the Edo Period in a han."
That would be Owari han, but the Edo period stretched from 1603 to 1868, so when exactly would it have split? Who passed it onto Nishikawa Kyusaburo and from which line of Takenouchi ryu (sodenke, soke or Bitchu-den)?
He also said, "Although from what I recall from seeing a copy of the book years ago, it has changed the techniques quite a bit."
I have not seen the book mentioned so I can't comment on it. The reason the techniques would be different is that Nakajima Masayoshi was also the head of Kashima Shinden Chokushin Ei ryu and Washio ryu. The school also would have had some influence from Tenjin Shinyo ryu which was also taught to Masayoshi by his father.