Just imagine though:

[juppschmitz]

The spell to get rid of the Mark is completed.

The Darkness is released. She is bound to Dean.

The Cage is damaged. BUT:

In this scenario MICHAEL is the one reaching out. To Dean. Trying to get him to work with him to put Amara back where she came from.

No pretending to be God. Michael knows that Dean won’t be fooled by that. He straight up contacts Dean…

*systems overload*
*abort*
*abort*