In SSKM, which was owned by Renkoji, there is a notation by Shaku Zenshin, together with the inscription of Honen's portrait, which Honen allowed Shinran to copy. If this notation is correct, it might be decisive evidence that Shinran changed his name from Shakku to Zenshin in 1205 (Genkyu 2). Furuta Takehiko asserts in his book Shinran's Thought: Critique of Historical Materials (1975), that the notation by Zenshin was a part of the handwritten document by Shinran, which had been given to Shoshin from Shinran himself in 1216 (Kenpo 4), and Shoshin inserted the document into SSKM in order to demonstrate that he was an authentic disciple of Shinran. In this paper, I verify that the document was not Shinran's own handwriting alone, nor Shoshin's autograph, from three viewpoints: the confusion of the order of SSKM, the historical investigation of languages in the document, and from the perspective whether SSKM fulfills the requirements as ketsumyaku monju (manifestation of authentic tradition of dharma). In conclusion, I have no choice but to affirm that the document was inserted into SSKM after the death of Shoshin. I reconfirmed my coherent assertion that the renaming of Shinran occurred in 1205.
