KISHIMOTO explained the differences between "The Tosa Diary's Interpretation" and "The Tosa Diary Overheard," saying that 'What Nahiko wrote is the earlier theory of Agatai no Okina, and what Umaki wrote is the later one.'
『土佐日記註』と『土佐日記打聞』とで説の相違があるのを、岸本は、「魚彦がしるせるは県居翁の早くの説、宇万伎がしるせるは、後の説なるべし」としている。