For example, Tsutomu TAKANO insists in his "Shotoku Taishi Ansatsuron" (1985) that Shotoku Taishi and Umayatoo were different persons, that SOGA no Zentoko, a son of SOGA no Umako, was the real Shotoku Taishi, and that SOGA no Iruka was a merciless imaginary character which was created later to hide the fact that SOGA no Zentoko was assassinated by Emperor Tenji.
例えば高野勉の『聖徳太子暗殺論』（1985年）では、聖徳太子と厩戸皇子は別人で実は蘇我馬子の子・蘇我善徳こそが真の聖徳太子であり、後に天智天皇に暗殺された事実を隠蔽するために作った残虐非道な架空の人物が蘇我入鹿であると主張している。