As the Kanasashi clan had a castle called Yamabuki-jo Castle, Chogoro KAIONJI surmised that Tomoe and Yamabuki were dispatched as aides-de-camp or secretaries by the Nakahara clan and Kanasashi clan, who were supporters of Yoshinaka, choosing capable daughters.
海音寺潮五郎は金刺氏の持ち城に山吹城という城があることから、巴と山吹は義仲の支持勢力である中原氏と金刺氏が一族の中でも優秀な娘を副官・秘書官として派遣したと推察している。