It is generally known that, for years, Mabuchi intended to promote his research on ancient words through works such as Kaiko (Commentary on Poetry), Buniko (Commentary on Literature), and Goiko (Commentary on Language), and to set up the philosophy of ancient Shinto after perfecting the fundamentals; however, in consideration of his old age, he passed on his attempt to advocate Fukko Shinto (reform Shinto [prominent 18th century form of Shinto, based on the classics, and free from Confucian and Buddhist influences]) to his successor, Norinaga MOTOORI.
古語の研究を歌意考・文意考・語意考などで進め、基礎を大成したうえで古神道の哲学を組成することを真淵は長年意図していたのであるが、自分の老齢を意識して、復古神道の学論を立てる企ては後継者である本居宣長に譲ることにしたということは一般に知られる。