According to "Azuma Kagami," Nobukane's sons were responsible for the incident, but from the fact that they went to Yoshitsune's residence, they seem not to have been deeply involved in the rebellion.
『吾妻鏡』では信兼の息子たちが事件の張本であったとするが、彼らは義経の屋敷に出向いている事から、反乱と深い関わりは持っていなかったと見られる。