User blog comment:Auditore7/Michael's power/@comment-3045936-20120930010224

All THEROIES based off opinions of myself, from what has been hinted and said. As to where Michael falls into power, I would say that he is God's most powerful angel and Archangel. Yes, Lucifer is weaker, but not like from Michael to Uriel in that range. After all they had to battle which would result in immense and I mean immense damage to the Earth. And Lucifer even said they mostly likely kill each other in Swan Dive. Now, before we go all into the Leviathan thing. I am OPEN to the theory that like regular angels, they are immune to angelic power from the Archangels. However, as neither is state or hinted really toward the Archangels we do not know for sure. (After, Castiel's vessal was decaying or melting as Death said from the Leviathans inside while he had million of souls inside.)

As to Michael when compared to Soul Powered Castiel or Godstiel. We don't know for sure, yes one comment makes people think he was saying that he was weaker than Michael. HOWEVER, right before that he told Crowley in regard toward Hells, he would have done away with it completely. (Now he could have meant destroy or shut down. But if he meant the first one, that takes power to destroy a spiritual world. Now I am open to that Michael could have done the same as well. But, yes it would be up to the writers to make a better story for the two Archangel brothers to fight, than just have Michael destroy all of Hell to get to Lucifer.) Now, back to Godstiel. It's hard to take into account, which comments hold more weight. But, I remember that Balthazar said to Castiel that taking in 30-40 million souls from Purgatory it would most likely take out Castiel and haft the planet too. Now if Lucifer and Michael's final battle, which would be the collective force of their total overall strength destroy the Earth. It would make more logically sense, in my opinion that a being with energy or a power source that can do identical damage at base level might be stronger.

After, all the souls by this theory would just be absorbed and released. They wouldn't be harnessed to their full power. Like a real supernatural atomic bomb. Meaning, 30-40 million souls are like the raw material that can make damage comparible to Lucifer and Michael's final battle. Now image that power correctly used and profound to max strength. Now maybe Castiel, didn't know HOW to use it yet correctly. But sigils didn't hide Crowley from him, and even Lucifer and Michael cannot sense where Sam and Dean were with the Sigils on their ribcages. As Castiel found them with Death. (At the same time, he could have just sensed Death or Bobby and guessed that Sam and Dean were with them.) Back to using it the power correctly, after all, if he did he would have stopped the Leviathans from destroying his Vessal aka Jimmy himself. Again all this is theories.

Final point. Michael is God most powerful individual Angel, Archangel, and being to date that HE created. Once and if the Leviathan's angelic power immunity is completely understand than we will know for sure. As for Castiel or Godstiel against Michael. My opinion is and has been this, he was or at least had power least equal to Michael or to some degree above him. And regardless if he couldn't or could have killed Michael. Who is say that the Earth wouldn't get damage. Or even if his powers were much greatly at this time, whom is to say that Castiel KNEW how to kill Michael.