i dont think the amaterasu descent has the same significance as sayyid. japanese society was divided by both class and lineage. sakke, the highest group of court nobility (koge), was exclusively the descendants of the fujiwara clan. the court nobles in turn were all ranked above the warrior class regardless of descent. even among the warrior class, whether genuine or not, purported imperial lineage was so common that only the senior branches held any kind of prestige.