Oh, hello! Sorry for jumping in. I just wanted to help clear things up.
And yes, Gadreel, who I know you might be all GRRRRRRRR FACE at for the whole garden thing, aaaaand there was the whole possessing Sam thing, which was kind of to save his life but also went ways that are probably more Sam's place to explain (also because I'm mostly reading this from the internet, rather than watching)... but he came over to Team Free Will in the end and gave his life to save humanity.