He stated that Shinsei SEI was a family member of the Inoue clan descended from a naturalized local ruling family in the ancient times and argued that if he was a descendant of the Fujii (葛井) clan, he would have chosen "葛", most common surname in China when he shortened his name into one word.
古代豪族で帰化人の末裔である井上氏の一族ではないかと主張し、葛井氏なら一字にする際に中国にも多い「葛」姓にするのではないかと主張。