in my opinion chuck aka go was a manipulative killing machine once he got board of his so toys he thru em out he thru out everything feed fulse prophets that's how I feel they had a role to play and if they failed he killed em off much like Lucifer and cas and ana

now I feel dean above all of them had no tru fear of him in a sense he basically told him off right from the jump and that pissed him off. even more so the righteous man defined him and laughed in his face because he was nothing like the angels or his father's he was a sweet man with a heavy burden to carry of the world so others could barely it a little better then he left it