User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5110811-20150606161023/@comment-5110811-20150606163910

There is no way God created the Leviathans when the Darkness was still around. Makes no sense. Since we now know the Darkness predated Light, God and even Death himself. God fought the Darkness before creation, because the Darkness would destroy God's future creation. And he made the archangels to aid him. So Death's statement in the season 10 finale indicated all along that there really is a delineation between Archangels and angels.

Prior to season 10 finale, the leviathans are thought to be older than archangels. Now with what Death said lately when Dean summoned him again, this case is closed.