User blog comment:General MGD 109/Who's the strongest demon/@comment-109.242.204.143-20140223083451/@comment-3481504-20140223195125

The 'archangels vs. Leviathan' thing is way too hazy to keep mentioning (although I wouldn't mind discussing it on your talk page, 109.242.204.143). Erik Kripke intended for Lilith to outmatch any and all interpretations of the row of Hell's hierarchy. The knife being able to hurt and kill Lilith doesn't necessarily mean Cain's stronger (any demon's susceptibility to it doesn't put all demons in the same boat), but in any case, Cain's power is probably enlarged by Lucifer somehow--such as his demonic smiting ability that no demon's ever used before in all eight seasons and his total invincibility to the knife. The fact that when he smites demons a red hue floods through the demon implicates that a significant portion of his power comes from Lucifer.