The problem of the theory of "Nihonshoki" is that Oke no mikoto's brothers had already been in Imperial Palace when Iitoyo no himemiko began her administration and on behalf of the brothers she just temporarily did administration and conveniently after her 10 months' administration, which was short for one year, she passed away and Emperor Kenzo was enthroned and thus there was no blank year between Emperor Seinei and Emperor Kenzo.
『日本書紀』の説の問題点は、飯豊青皇女が執政を始めた時は億計尊・弘計尊の兄弟はもう宮中にいて、この兄弟の代理で一時的に政務を預かったにすぎないばかりか、ちょうど都合よくなぜか1年に満たない執政10ヶ月で死去して顕宗天皇が即位したため清寧天皇と顕宗天皇の間には空位年がないことになっていることである。