I think Misha brought up a really good point in this interview, because even when we talk about human Cas, Cas is and always will be an angel. But what he’s experienced on his journey has taught him so much, has changed him so much, that he knows what it’s like to be “human”, and wouldn’t at all have a problem living on Earth amongst other humans, or with one in particular.
I am reminded of the angels in Captives who lived peacefully amongst humans, who learned to adapt and change and grow. Who learned that there’s more to life than Heavenly battles and serving an absent God. You will never convince me they gave Cas all that pop culture knowledge just for laughs, he was given that for a reason. While he may not have context for those references, it allows him to relate to Dean and Sam more than ever. It will allow him to, if he so chooses (and I believe he will), live life on Earth with them more easily.
I really do feel like more than anything this season will be about finding balance. Because to Cas, being an angel has been bloody and tragic and violent, and while being human wasn’t much better, I do think, had Dean not kicked him out in 9x03, he would have stayed with them, and remained “human” by choice. But…he is an angel, and I guess some time last season I shifted my focus from wanting Cas to choose being “human”, to wanting Cas to choose himself and what is truly best for him. Hiding from Heaven, or from who he is, does not fix the problem after all.
I think more than anything he wants to be an angel, but have that mean something that it never has before. He can have grace and powers and still choose a life amongst the humanity, and the human lbr, that he loves more than anything. I think focusing more on Cas on Earth, instead of Cas waging war in or on Heaven, is going to be a fascinating look into what it is he truly wants. And if his sole mission before he dies is saving the life of one human, I think we have our answer already…
I think when he said at the end of S09 that he wants to be ‘an angel’ it was him flip-flopping between extremes, like the boys do. The whole - you’re either in or you’re out, all or nothing mentality. Like Sam felt he had to leave hunting and the supernatural completely in order to be with Amelia and leave Amelia in order to hunt, and Dean was the same with Lisa (although he at least kinda TRIED the balancing thing with Lisa, though unfortunately it wasn’t right with Lisa).
So yeah - Cas is going through the same issue, thinking he either has to be 100% human and disconnected from the supernatural/angels completely, or 100% angel and embrace angel mojo even if it kills him and be a leader even if he hates the job etc.
So, yes, basically my point is - AGREE WITH THE ABOVE, ultimately. Cas, like Sam and Dean, needs to find a MIDDLE GROUND, a BALANCE. He needs to learn he CAN ‘be an angel,’ but he can live among humanity, live as a human, AS WELL.
And I think that is what the narrative is working towards.
This was theorised by others a few seasons back, I think, and I agreed then. But then last season changed my mind cos I felt perhaps we were heading towards Cas choosing to be human after all. But now I’m back on this ‘best of both worlds’ theory - Cas living as a human without having to be 100% assimilated into human culture, as it were.