Kusakabe and Otsu were around ten years old when Emperor Tenchi passed away; therefore, the difference in their ages with Iratsume makes it somewhat difficult to believe these two Iratsume were the same person.
天智天皇崩御の際、草壁・大津は10歳前後であり、郎女との年齢差を考えると、このふたりの郎女が同一人物であるかどうかは問題もある。