Well, Bobby = Unstoppable Awesome. Good guy to cling to. I've been talking with other SPN friends and we think that Cas wasn't brainwashed like we thought. He's obviously conflicted and hates himself, so he's got to have his own reason for towing the party line.

Maybe he's protecting Dean somehow, or he's investigating what's going on in Heaven's chain of command or something. He's still "Dean's guardian angel" on the inside but he's being watched and he has to pretend he's a dick. I think in the finale he's going to do something to once again be the conflicted angel we loved him as.