User blog comment:Enriant/Heaven and Hell/@comment-1975828-20160602031640/@comment-26271908-20160608015028

Saying he became one with the Mark is speculation. Right now, Cain is one of the strongest demons, but I don't think he is really stronger than Lilith. The part about Metatron is something I noted to be a problem in the lore because, as we know, Angels are stronger than Demons, but the high-ranking Demons can defeat Angels. However, when Metatron connected to the Tablet, he basically became a new God - Personally, I think that he just got up to where an Archangel would be, and that claiming himself to be God 2.0. was just arrogance - So, he would be far above Cain in power, yet Dean was not able to defeat Cain but was able to hurt Metatron. I guess it was just for the sake of having a powerful antagonist to be defeated in order to create a certain atmosphere, but it really didn't worked well - I'm one of the many fans who still hope to see Cain returning alive and well

I have the feeling that Cain, just like Lilith, could be more used. Cain appeared in just two episodes but he was one of the strongest demons ever and could add something new to the storyline, but was marvelously bumped down to a monster-of-the-week

I just stick to having Lilith as the strongest bad bitch. One of my greatest disappointments is that she had to few appearances and, even displaying some really great powers, she did, like, using them only once. The White Light was very impressive before the writers decided that any Angel could have it, despite only powerful beings having it in the beginning