User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-190.92.7.204-20150612220839/@comment-24834479-20150614204529

I definitely agree that Cain is the most powerful demon. First of all, he could smite other demons, which Lilith has not been shown or implied to do. Yes, she can blast white light, but as far as we know, that might only work on humans. Also, I'm not sure if Cain is able to kill Angels by himself. Yes, he said that he would swat Castiel like a fly, and yes, he didn't have the first blade, but he could have summoned Castiel's angel blade to him, and used that; Just like he swiped it out of his hand later in the episode. On the original note (about Cain being more powerful than the Leviathan), I think that Cains power was limited to below an archangel, because he thought that Lucifer was the source of its power. If he had known that the mark was powered by the Darkness, he might have been more powerful than the archangels, and even Leviathan. (The placebo effect)