I'll tell you from days 21-23, Dean will be drinking straight through. His bitterness is rising, after not being able to experience his happy ending himself and Cas here after his happy ending. Plus, all the death and the lack of answers. So, if you want him to get full on enraged at him dying -- or possibly do something he'll do at the end of the world, like, make a move...

These are all possibilities!

There could also be a drunken decision made that could make things better or worse in the long or short run.

So, much, much to look forward to.