However, because it is a fact that Raigo made great efforts for the construction of Buddhist ordination platform of Mii-deraTemple, which is the Grand Head Temple of the Tendaijimon Buddhist sect, it is said that the Tesso legend was born in the context of the confrontation between the Tendaijimon Buddhist sects and that it occurred at the end of the tenth century.
しかし頼豪が三井寺の戒壇院建立に尽力していたことは事実であり、三井寺が天台寺門宗の総本山であることから、鉄鼠伝説は10世紀末に起きた天台寺門宗の派閥間対立抗争を背景として生まれたものといわれている。