User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-27006668-20151003004333

If Castiel only had one soul or leviathan in him, would he be able to do what he did to Raphael, would he be stronger than Michael.

How much, if at all was Godstiel stronger than Michael or Lucifer?

Godstiel was still scared of releasing Michael and Lucifer, at the very least implying that he was scared that either together or individually they'd be able to defeat him. How would Michael and Lucifer fare against Godstiel?