Yoshiki KONDO authored "Theories of Legitimacy" in 1829, put forward a theory that the Jinshin year was an interregnum, and argued that interpretation of the inscription of Yakushiji Temple and the tai sui article did not necessarily follow that Otomo was enthroned.
また、近藤芳樹は文政12年（1829年）に『正統論』を著し、壬申年は空位の年だったという説をとり、薬師寺銘や太歳記事の解釈も直ちに大友即位を意味しないと論じた。