However, there is little basis for the assumption that Shinran founded Kosho-ji Temple in Yamashina, as well as the fact that Shinbutsu was already responsible for Senji-ji Temple in Shimotsuke Province (present day Tochigi Prefecture) at the time of Shinran's journey to Kanto for the dissemination, and the likely theory claims that Shinran travelled directly to Kanto from Echigo.
しかし、真仏は親鸞が関東教化に遊行した際に下野国（現在の栃木県）に建てた専修寺を任されているなど、親鸞が山科に興正寺を建てたとするには根拠に乏しく、一般的には越後より直接関東方面へ旅立ったとする説が有力である。