Well, the show definitely likes to provide fanservice for either spectrum of the fandom. I mean hell, they had Wincest porn in the premiere episode this season on the intentional level, so I wouldn't put it passed Kripke and the writers to do something like that again with another character. ;) But I think in terms of context, yeah, "neurotically" does make more sense esp coming from Zachariah.

Dean belongs to Cas :p (Or vice versa, Im not so sure after this episode, lol)

Oh, Dean is totally Castiel's bitch. ;) Definitely. DID YOU SEE THAT WALL!SLAMMING AND THE "I DEMAND SOME RESPECT BITCH" GLARE FROM HIM? DOM!CAS = MY FAV. :DDDD