User blog comment:Tommy,Klaus&Kol2012+/How to Kill a Levithan/@comment-2020973-20120227040641/@comment-3481504-20120228004745

That's interesting, cause as said in "Meet The New Boss", Cas claimed that he'd eventually dominate over them, and fix his vessel, but they're proved too strong.

The only possible way would if they were on the outside, however it was their presence that made Godstiel so powerful.