User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5106744-20120611040013/@comment-5110811-20120611145512

Get your facts straight,

1.) Leviathans don't have souls. This is one of the first established facts about them.

2.) They never killed any archangels. You completely made that up.

3.) Those angels that Edgar killed are not archangels. They were two mook canon fodder angels of Castiel's garrison - in which he used to be the Captain of.

4.) Sam didn't overpower Lucifer. He temporarily took over his own body through will power, based on memories of his love for Dean- his brother, long enough to activate the cage and jump in it along with Michael. Only Sam can do that since he is Lucifer's true vessel. So only he has the chance to stop him. That doesn't make Lucifer to be weak. Nick, his temporary vessel, couldn't do that. And nobody else can either.