Among the secret stories told in later years about his birth is a theory that he is the secret son whom Imperial Prince Arisugawanomiya Taruhito had with a woman other than his wedded wife, and some say that behind the crackdown of Omoto was the intent to seal this theory which could potentially become a threat to the imperial succession issue of Emperor Taisho.
後年にいわれた出生に纏わる秘話に有栖川宮熾仁親王の御落胤説があり、大元に対する弾圧の背景には大正天皇の皇位継承問題を危うくしかねないこの有栖川御落胤説を封印する目的があったという説もある。