However, studies also suggest that although Kiyohara clan was boasting the ironclad solidarity during Zenkunen War period, the discord and frustration against the head of the clan Sadahira was developed within the clan after the Enkyu Ezo War, causing the Gosannen War that led the downfall of Kiyohara clan.
しかし、この合戦での軋轢や当主真衡への一族の不満などから、前九年の役当時には一枚岩であった清原氏内部には次第に不協和音が生まれ始め、最終的には後三年の役を招いたとの評価がある。