User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-119.224.7.225-20140104102322/@comment-82.39.105.22-20141113104701

That wasn't Levi power, that was power from the souls of Purgatory. Levis just hitched a ride inside Cas to escape.

Cas DID obliterate Raphael, but he mentioned not wanting to release Lucy or Michael. Michael>Lucy>>>>>>>>>Raphael>Gabriel

That being said I still think Levis would kill AAs. They're not as powerful as AAs, but they have the know how to turn off an AA's power. Which is basically like a cheat code if you think about it, totally unfair lol.