User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-83.253.153.202-20111226235346/@comment-5605779-20111227045120

Exactly. He was never made an archangel, nor as strong as one. He only gained the strength of an archangel (or to be more specific, a God) when he absorbed all the souls from Purgatory.