Since 'KANZE Kojiro Nobumitsu ga zo-san,' which was written in his later years, described the roots of the Kanze family as well as his own life in detail, this book has been considered source materials about the Kanze family up to the present.
また晩年に書かれた「観世小次郎信光画像讃」ではその生涯とともに、観世家の出自が詳しく語られ、近代に至るまで観世家を語る上での基礎資料として認知されていた。