However, it was only a limited comment, and this idea of Motoori was further developed by his disciple Tatsumaro ISHIZUKA who wrote "Kanazukai Oku no Yamamichi" (The Mountain Road into the Secrets of Kana Usage) (published around 1798).
ただしその指摘はまだ一部に限られており、この宣長の着想をさらに発展させたのが彼の門弟・石塚龍麿による『仮名遣奥山路』（1798年頃発表）である。