However, even if it was the case, Emperor Tenmu (Yamato sovereignty) had to create the Yakusa no Kabane system which resulted in the dysfunction of the original kabane system since the kabane were given to too many people, and uji and kabane became integrated through heredity as the system of clans and hereditary titles based on a ritsuryo legal code remained simply as a form.
しかし、仮にそうであった場合でも、律令的氏姓制度が形骸化するに連れて、氏（ウヂ）と姓（カバネ）とが世襲化により一体化され、その構成員もいたずらに増え過ぎてしまったため、のちにヤマト王権（天武天皇）自身が八色の姓（やくさのかばね）によって全く新たな官位制度と連動させつつ氏姓の制（うじかばねのせい）を実質的に無意味化せざるを得なかった。