Furthermore, the fact remains that Emperor Tenmu introduced new kabane such as mahito, ason, sukune and imiki rather than using the ones that had already been passed on, that he allowed only the members of an immediate Imperial Family to be in the position of Ujinokami which had the right to give kabane, and that he even had the authority to give permission in the beginning.
しかも、世襲化されている旧来の姓（カバネ）ではなく、全く新たな姓（カバネ）である真人（まひと）・朝臣（あそん）・宿禰(すくね)・忌寸（いみき）を導入し、それらを賦与ないし継承させる氏上（うじのかみ）を直系親族に限定し、その許認可権すら当初は天武天皇自ら握っていたという事実は動かない。