User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-4343332-20120313223418/@comment-3481504-20120313233127

By Cas' multiple deaths, Jimmy is dead, only being a body/vessel, so that can't be it, unless he somehow survived having his body "popped" by Raphael and Lucifer.

If he did somehow survive, how could he go about tapping into Cas' angelic power. I mean, such implementing was mentioned and even shown.

1)With Lucifer suppressed, Sam was able to tap into the archangel's strength, that's how he pulled Michael in the Cage.

2) Jeffery spoke of being invigorated by his demon's power, meaning the powers it gave him.