Although many historians were in favor of Seki's opinion, Kojiro NAOKI suggested another opinion; according to it, Kai no Yusha had served as a personal follower of Fukei since before the war, because it was too short time since the dispatch of the messengers on July 29, 672 until the battles in August.
この説は一定の支持を得たが、直木孝次郎は6月26日の使者発遣から7月の合戦までの期間から疑問視し、乱以前からの私的従者としている。