User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-63.117.245.61-20120512193405/@comment-3045936-20120513142854

You also have to look at this. Regardless if you put Godstiel at weaker, equal, or stronger than Michael and Lucifer's power, Godstiel was at least in the higher power class of the Archangels, and was able to maintain the Levianthans for a time and many of them. So its possible that Archangels have some much more power than normal Angels that they cannot be at least not completely blocked by Levianthans or are strong enough to affect them to a degree at least.