It is believed that Rokudai spared his life since the wife of Koremori (mother of Rokudai) remarried Tsunefusa YOSHIDA, who was the Kugyo and deeply trusted by Yoritomo, after the death of her husband.
また、前述の維盛の妻（六代の母）は夫の死後に頼朝の信頼が厚い公卿の吉田経房と再婚しており、この事も六代の助命と関係している事が考えられる。