User blog comment:McGillicuddy/Luzifer in Season 10 ?/@comment-26037147-20150419222047/@comment-3481504-20150420011422

I guess seeing as Carver owns all the rights to the show, at least according to EmpyreanSmoke, that they can bring him back. But, how? Only the Four Horsemen rings can open/close the cage, or possibly the breaking of 66 more seals, or God and Death. If Metatron, the frickin' scribe of God, doesn't know how to remove the mark, I highly doubt some earthly text would know. So, Lucifer, God, or Death would have to be involved in the removing of it.