User blog comment:ImperiexSeed/Castiel's shifting of Sam's mental problems made no sense!/@comment-4873164-20120403141655/@comment-3481504-20120404133332

Well, they're connected, in that he's physically in Jimmy, making them in a way, related.

You're wrong. If Jimmy is dead (which he is), his wants, desires, and affects are all no longer. Like no dead person still loves food.

What I'm trying to say is Cas is pretty much possessing a corpse. Lucifer can't talk to Jimmy, he only did so with Cas.