That's also another reason why I love this show. There is so much you can speculate and discuss about. With some things you will find out the truth later and some will always remain in the dark.

But I'm starting to see now how the craving for burgers could still make sense without Jimmy around. I'll stick to my version for now but of course yours could just as easily be true. I wonder if and when we'll find out for sure what happened to Jimmy.

Hm, if this episode was the first step of what happened to Cas in "The End" then it was also the first step of what happened to Dean. And while losing his powers surely is unsettling and traumatic on its own, the real reason for Castiel to feel useless in "The End" is probably that he could never help Dean. They always fought side by side but on an emotional level Dean probably always pushed him away just like he did in that last scene of last week's episode.
So I think how things will turn out for Castiel and how traumatic they are going to be is closely intertwined with how they will turn out for Dean.