ok but like
1) Lucifer still has the Mark???? technically??? Because Cain still had the Mark even after he transferred it to Dean so shouldn’t Lucifer still have the Mark after he transferred it to Cain???? And as long as one entity has the Mark shouldn’t the Darkness till be at bay?????
2) Death said he could reap God. GOD!!! Are you telling me that one lonely little Mark makes someone so powerful that a fucking jawbone can kill them but Death can’t?????
3) Also like, fucking Death was in Sam’s mind and saw how fucking destructive and powerful their codependency was and he was like “you know what would be a great idea?? Making Dean kill his brother. I’m sure nothing can go wrong there”