Thank god Kevin is gone. He was getting so annoying in these last few episodes, with all his whining and complaining over and over. Gadreel is also quite annoying. His cadence and his tone are getting a bit overused, so hopefully he doesn't last too much longer. Dean, Crowley, and Cas are a fun group of people for an episode, I hope this happens again sometime soon. I think this is the first time we see a dual possession as well, and Gadreel is ousted from Sam. I'm sure Sam will be just delightful with Dean about this whole thing, and will hold it against him for the foreseeable future. Crowley is taking a much more central role in the series, and this is definitely for the better.
