However, because Mototsune's daughter entered Imperial Court as a Consort of the emperor after the incident, it was considered to be a scheme of the Fujiwara clan, who was wary of TACHIBANA becoming a maternal relative of the emperor by the accession of the imperial prince of Yoshiko, who was the daughter of Hiromi.
しかし、事件後に基経の娘が入内していることから、この事件は広相の娘・義子の産んだ皇子が即位し橘氏が天皇の外戚となることを警戒した藤原氏の陰謀によるものと云われる。