User blog comment:McGillicuddy/Luzifer in Season 10 ?/@comment-3481504-20150406022721/@comment-3045936-20150407212517

I thought he sold the rights with conditions certain things can't be altered. Like he can't override the show runner but his ideas are still considered whenever he gives them. On the Mark being what Metatron called God or Lucifer level Magic, I can't say at this time. But I think that unlike Sam's soul damage from being in the cage, the Mark is a more external thing. Not damages that causes soul or mental damage, as Dean got the Mark when on the Earth or Material Plane. So maybe it's removable even if it's on the soul.