User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5605779-20111221215039/@comment-98.116.71.110-20111224205828

You're only speculating. You don't know if an Archangel can contain all those leviathans. Even Uber-Cas wanted Crowley to make sure Michael and Lucifer were kept in the cage. that's one of the reasons why Crowley was spared from oblivion. If those two were nothing compared to Cas like Raphael. Why would he even bother having Crowley safeguard the cage then?