User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-6449959-20130328021324/@comment-5767263-20130328040049

1. Roman wanted to subjugate and displace humanity from the top of the food chain, and according to Edgar, 7 billion humans isn't enough for the leviathans. Dick's presentation in Survival Of The Fittest included details about some of the humans being sectioned off for experimentation and others being used for a breeding program, which would enable them to replenish their food source. If they just go out and eat people willy-nilly, then they will eventually run out. In this case, it wasn't about power so much as it was efficiency.

2. Remember, Lucifer doesn't hate angels. To him, they're family. He hates humans and demons. He wouldn't want to use the tablet because it would mean locking away everyone that he loves (and probably himself as well). Plus, he was confident that he could defeat Michael on his own, and if you're that sure of yourself, then the opposition of a single archangel who's weaker than Michael and a horde of angels who can't do a thing to you probably doesn't seem very pressing.

3. I like to think that the archangels predate the leviathans as well, but it isn't impossible for Metatron to have come after the leviathans. Even if Metatron was created after the levis, God could very well have just told Metatron what he needed to write down.