User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-79.115.68.194-20150912123635/@comment-24834479-20150912233322

If you interpret Seraphim to be different than the angels that we normaly see, then there are probably other Seraphim still alive.

I like that idea very much, and think tha it might come to play in our mythology. We are still writing to history of the Darkness, and so we will see.

Yes, Abbadon was stronger than Lilith was, but Lilith ranked higher.