The relationship these materials have with the literature as pointed out by Kuniji YASHIRO have been considered in later years, and Fumihiko GOMI concluded that there was no indication that "Gyokuyo," a court noble's diary during the period of Genpei War, and "Kikki" were used as source materials.
八代国治が指摘した文献との関係ついてはその後も検証がなされ、現時点で五味文彦らは、源平合戦時代の公家の日記『玉葉』や『吉記』などが利用された形跡は無いとしている。