There is another theory that the Emperor was said to be immoral, given the fact that Cloistered Emperor Gomizunoo wanted Imperial Prince Satohito's early enthronement and because the Edo government didn't approve of the Emperor Gosai's family line being the cousin to a strong outside daimyo (the Sendai clan), whereupon both parties caused the Emperor's early abdication to take place.
もっとも、識仁親王の早期即位を望む後水尾法皇と有力外様大名（仙台藩）の従兄弟という天皇の血筋を嫌った江戸幕府双方の意向の一致が天皇の早期退位を志向し、それが「天皇不徳説」の根底にあったとの見方もある。