It had been only three months after Yoriie had succeeded Yoritomo's position as Shogun when the council system of thirteen members was introduced, therefore making it improbable that it was formed due to a lack of Yoriie's abilities.
十三人の合議制がしかれたのは、頼家が頼朝の跡を継いでわずか3ヶ月後であり、頼家の政治能力の欠如によるものとは考えにくい。