User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-76.95.86.12-20120519182004/@comment-5110811-20120521144742

You know the special children had to grow up to be adults, right??? So that took more than two decades for one of them to be old enough to break the last seal - which is to kill lilith. Meg and Crowley are mid level bosses, it is unfair to compare them to a seasonal bosses like Azazel, Lilith, Eve, and Dick. Lucifer is a major multi-seasonal boss. he was the ultimate boss for five seasons pulling all the strings.

It only took a couple of episodes to break open purgatory. And what you think about how God feels is irrelevent. He is God. He can destroy his own creations if he wanted to. For some reason, he wanted to lock up the Leviathans. If he hated them so much, He would have killed them right then and there. But he chose to lock them up for reasons unknown. Much like how he created hell and Lucifer's cage. He sent Michael to cast him down and finally to beat him and lock him up in the cage. The same reason is maybe likely the case with the leviathans. God created Purgatory and ordered Michael to cast down the Leviathans into purgatory to lock it up. I don't see why that's not probable. Michael is the eldest archangel and God's mightiest warrior. His second in power and command. God doesn't get involved directly. He issues commands to his top angels.