Dean "brotherzoning" Cas in 11x23 is in character (and can make sense with Destiel)
I (like most Destiel fans), hate Dean calling Cas a brother in 11x23. But honestly, if you look at the season, it kinda makes sense.
Daen is totally flustered when Mildred says that he is pining for someone (not Amara), and I think this was talking about Cas. I would argue he is is pining for Cas (and knows it) but thinks it is in a platonic way. The thought of his feelings for Cas being described as pining causes him to kinda deny deny deny. Dean's heart is literally weakend bc of emotional turmoil in this episode, for reasons he denies knowing.
And is love is literally cloaked in shame (as told by a monster pretending to be Amara), and he is also canonically not in love with her.... (Yes, this could be dramatic irony bc he doesn't actually love Amara, but it does not come across that way).
Still, despite his cosmic bond with Amara, he is more worried about Cas when Lucifer literally hurts Amara while inhabiting Cas' vessel.
So, its no surprise to me that he tells Cas how much he loves him (by calling him a brother) after all that.
Dean is reverting back to a comfortable way to express love, the only way that has really stuck with him - familial love, specifically with found family (Bobby, Charlie), after his feelings with Cas kinda fly too close to the sun if you will (whether he knows why his feelings are so deep, I don't know).
I see that too in 13x06, where when Cas returns, he calls him pal (I think) which is totally unnecessary. In 7x23, when he is telling Cas how he wants him to come with on a suicide mission, he uses a baseball metaphor to say how he wants Cas, cursed or not. These are both reducing Cas to found family/a close close friend, when the mourning that Dean was doing in the seasons, while not inherently romantic, felt pretty damn romantic to me.
Point being, this is Dean yet again "no homo"-ing the feelings he had towards Cas in the season where they are arguably most pronounced (and repressed before our eyes) (the best Dean reciprocates seasons are the ones where Cas is gone ironically) they have ever been. He is literally trying to repress all his feelings about literally killing himself to save everyone this whole episode...
(You could argue that he really does view Cas as a brother, and feels awkward at other implying romance when the pining is just for Cas to be back and safe, but I mean, the vibes are just not that.)












