Although killing powerful relatives and vassals happened generally when daimyo in the Sengoku period tried to centralized the power; however, unlike the cases of Nobunaga ODA or Hideyoshi TOYOTOMI, Nobutora failed to comb out his vassals and that is why Nobutora is regarded negatively.
しかし有力な親族・家臣の殺害は、戦国大名が中央集権化をはかる際に広く行われたことであり、織田信長や豊臣秀吉などの場合と違い家臣の整理に最終的には失敗したため否定的な評価につながったという面がある。