Okay,
The fact that Cas actually put value on himself.
Not on his angel powers, or his ability to be useful, not even on just his relationship with Sam and Dean.
But that somewhere, along that lonley road he had to travel when he fell, when Sam was possessed by Gardriel and Dean gave him the boot, even in a body that was not always his own, in a world that was not built for him to walk, that he found who he was. Not as a human, or as an angel, but as Castiel.
He doesn’t need his bells and whistles. He never has. We know that, Dean knows that. And y’all can catch me in the back crying fam