Another theory suggests that the Kira clan was attacked and fell by the Motoyama clan, but the credibility is low due to Shigetoki MOTOYAMA's pretension of the Kira clan and from the other documents.
他に永禄5年（1562年）に本山氏に攻められ滅亡したとする説もあるが、資料や本山茂辰の吉良姓僭称から信憑性は薄い。