During that time, it was difficult to classify every official as a Kurodo because there was a clear distinction between the Fifth and Sixth ranks in terms of social status, as well as considerable differences between their social activities and custom rituals.
当時は五位と六位の間に身分上明確な一線が引かれ、官人の行動や儀制面で大きな差があったため、蔵人を一括することが困難であった。