I think they all did an excellent job tonight. Solid performances all around. Jarad had some great scenes, he doesn't always get to stretch himself. I loved Cas as a Human, now he has to get himself to the bunker. I adored clever, overwrought Dean. Those Angels always underestimate the boys.
Like you I am unsure about trusting this angel, is he going to leave Sam when he is supposed to.
I was happy to see Death, one of my favorite characters.