This system was originally referred to as Takagi Ryu Bojutsu from the 1st generation Grandmaster, Takagi Oriemon, to the 3rd, Takagi Gennoshin. However, the 4th generation Grandmaster, Ohkuni Onihei combined Hontai Kukishin Ryu Bojutsu with the Hontai Takagi Yoshin Ryu Jujutsu to form a complete system which drew upon the strengths of each school.
The true Hontai Takagi Yoshin Ryu Grandmaster/Soke will have a Hontai Takagi Ryu Bojutsu Menkyo Kaiden as proof of having full knowledge of the school. Therefore, in a pure sense, you cannot separate Hontai Takagi Ryu Bojutsu from Hontai Takagi Yoshin Ryu Jujutsu. Further proof of being the authentic Grandmaster/Soke is having the Kukishin Ryu Bojutsu Hihohen Densho and Amatsu Tatara Kangi-no-maki scrolls. Takamatsu Toshitsugu awarded the Grandmaster-ship of this tradition to Sato Kinbei in the month of May in the year 1952. In turn, Sato Kinbei awarded the Grandmaster-ship of this tradition (among others) to Tanemura Shoto in the month of October in the year 1989.
Hontai Kukishin Ryu Grandmaster Genealogy:
Takagi Oriemon – Takagi Umanosuke – Takagi Gennoshin – Ohkuni Onihei – Ohkuni Yakuro – Ohkuni Tarodayu – Ohkuni Kihyoe – Ohkuni Yozaemon – Nakayama Jinnai – Ohkuni Buemon – Nakayama Kazaemon – Ohkuni Kamaji – Yagi Ikugoro – Ishitani Takema – Ishitani Matsutaro – Takamatsu Toshitsugu – Sato Kinbei – Tanemura Shoto