If Hashihito no Himemiko was the same person as "Nakatsusumera-mikoto," there is a question why only she had this special name; alternatively, it is said that this name could have been for Empress Saimei, but there is no proof.
もし間人皇女＝「中皇命」とすれば、なぜ彼女だけが特別にこうした呼称で呼ばれる必要性があったのかを考えられるが、斉明天皇だとする説もあり、必ずしも確証は無い。