Although there is no definitive proof as to whether this is true or not, according to the 'Mizukagami' (The Water Mirror), Emperor Konin planned to have Imperial Princess Sakahito become the Crown Princess; if true, this must have made Emperor Kanmu and his circle extremely wary of her.
また、信憑性にはやや欠けるものの、「水鏡」によれば光仁天皇が酒人内親王の立太子を検討していたとも言われ、もしそれが事実ならば桓武天皇やその周辺にとっては警戒すべき相手であったとも言える。