From the above, HOSOI makes a point that the true ringleader of this incident was none other than Empress Shotoku herself, and the true nature of this incident was that the empress used the oracle from the Usa Hachiman-gu Shrine to overcome the problem that the person whom she wanted to appoint as her successor was Dokyo who was from a non Imperial family.
以上のことから、事件の真の首謀者は他ならぬ称徳天皇自身であったとし、指名者が非皇族の道鏡であったという問題点を克服するために宇佐八幡宮の神託を利用したのが事件の本質であったとしている。