FUJIWARA no Munetada questioned in his diary, "Chuyuki," whether Masamori, who was not considered to be exceptionally skilled in the art of war, had actually killed Yoshichika, who was renowned for his bravery.
当時も勇猛な義親をそれほど武に優れているとは認知されていなかった正盛が討ったのかについて疑問があったことは藤原宗忠の日記『中右記』などにも記されている。