According to the Kyudo genealogy of Yamato school, Kozan mastered each esoteric technique of these schools: Itsumi school, Heki school Dosetsu line, Heki school Okura line, Heki school Insai line, Heki school Chikurin line, Takeda school, Ogasawara school.
大和流弓道系譜によれば、逸見流、日置流道雪派、日置流大蔵派、日置流印西派、日置流竹林派、武田流、小笠原流、各流派についてその秘奥を究めたとある。