Wow, that's pretty amazing to hear! That is very much how I see Cas: he has that uncertainty and world-weariness and almost an emotional detachment about him – but all threaded through with poise and confidence, and general badassery, and his obvious love for Dean. I think he is hard to write well because he is such an enigma. Edlund made the comparison with Asperger's/high-functioning autism, and he does have that feel to him. I wonder if that's why Edlund inserted the man with autism into Castiel's Heaven?

Your version reads a true to my own headcanon version of Cas as I've ever read!