Appearances
Sympathy for the Devil isn't the first time Michael was mentioned he was also mention in 2.13 {C "Houses of the Holy" 64.141.83.253 23:45, September 28, 2009 (UTC) Smallville94
It's not confirmed who is stronger, Luciifer or Michael
Actually, it has been mentioned several times in the show that Michael is either slightly stronger or much stronger than Lucifer, both out of common sense that he is the older brother (who "practically raised" Lucifer since he was born), by Dean's confidence about him being able to kill him, which is a clear way for the producers of the show to get this message across ("We go nuclear..." "...Michael can ice the devil." "Battle's gonna' torch half the planet."), by Lucifer's confidence that his plan will succeed because he knew Dean would not say 'yes' to him (in 5x04), by Lucifer's speech about Michael to Sam where he mentioned that he "idolized" Michael and that Lucifer had "begged" him to "stand with me" (which could possibly mean that Michael was his mentor), by Lucifer's almost 'fearful' (to a certain degree) reactions, given by his facial expressions to Michael's words in the fifth season finale, and finally by the fact that it was Michael who fought, defeated and banished Lucifer to the Cage in the first place. It's also presumable and likely that the power of a certain angel is determined by their age: this would explain why the first four angels are called 'Archangels' and why Gabriel has less power than Lucifer, who is older than him, and why all younger angels have much less power than the Archangels.
Swan Song Updates
There needs to be some updates from Swan Song for example Location Changed to hell and Occupation Former Viceroy of Heaven since Castiel now has that posistion
As a matter of fact, Castiel is fighting for that position since Raphael wants to take it temporarily to be able to release Michael and Lucifer from the Cage. It's still unclear whether Castiel in fact wants the position for himself or if he simply wants to stop Raphael.
From the Transcript of Supernatural Season 7 episode 1 Meet the new boss.
CROWLEY: {C I take it you intend to keep the live share? So, what you're saying is hell's being downsized?
CASTIEL: {C I would have done away with it completely, but I need a threat to hold over my enemies, and we need to keep Michael and Lucifer's cage.
Now this is not to change anything. But an wikiauser as they were not logged in stated that that was Castiel's exact words. While its not unrealistic to see how its said that he/she would think that this is the exact words.: The Twilight of Your Despair 17:09, February 17, 2012 (UTC)
Here's is a link to the scene: http://www.youtube.com/watch?v=VfL6VDmgKRs&feature=endsceen
If you turn up the volume and listenly carefully, Castiel clearly says "And we need to keep Micheal "in" Lucifer's Cage", as you do not hear the "duh" sound. 76.212.204.224 17:37, February 17, 2012 (UTC)
I here and not in. Maybe Misha said in when its suppose to be and but the transcripts that are the Supernatural superwiki are direct copies from each episode.: The Twilight of Your Despair 18:48, February 17, 2012 (UTC)
I rewatched the scene at full volume a few times and I still clearly hear Castiel say "And we need to keep Micheal "in" Lucifer's Cage." Although your suggestion is a possibilty, there is no way prove otherwise. As far as we know it could also be a result to a slight dialog change as the scene was being filmed or even a typo in the transcript. In the case of dilalog, we must go by episodes themselves over transcripts as the former is the finished product. 76.212.204.123 20:45, February 17, 2012 (UTC)