I honestly think the end game here is restarting the apocalypse.
The angels all thought the apocalypse was "destiny" but sam and dean proved them wrong and proved "free will" will always triumph over anything thought to be pre destined.
What if the apocalypse was never a "destiny" at all?? What if it was a fail safe measure for if the darkness was ever released??
Let's really dig into this. God chose lucifer to battle the "darkness" in the great war. Lucifer litteraly means "Light Bringer"
Lucifer was his most trustworthy but was corrupted by the mark of cain.
What if the spell that removed the mark from dean also removed the mark from Luicfer???
That's why michael and lucifer were goig crazy in the cage. They realized the mark is gone. So the darkness has been realeased.
I dont think sam and dean are gonna become vessels again. I think sam dean Michael lucifer and god are bout to wwe tag team this bytch to oblivion
But the twist here is dean is bound to amara. Its all about siblings
Dean/Sam
Michael/Lucifer
God/Amara
Its clear at this point Sam and Dean are basically the 2 most important humans ever. They have a bloodline that dates back to cain and abel.
Sam was targeted by Azazel from birth
Their mother name is Mary(virgin mary)
Dean was Alistair's apprentice in hell.
They were the chosen vessels for the apocalypse
They literally been to hell heaven purgatory and back
There best friend is a angel and they have the king of hell on speed dial.
They both are a part of this