Can we talk about the second one down and the way (admittedly fake) Gabriel calls Cas on his bullshit about how he’s unextraordinary. This is really important in the context of his self concept, because there’s a difference between denial and modesty/humility/self loathing, and that can be a tough line to walk.
I think given his uniqueness as an angel who experiences and understands free will, he is given to bouts of terrible depression and doubt, even self-loathing. He understands he has a terrible track record, and that kind of negative cyclical thinking can lead someone to consider terrible things, such as suicide, which Castiel has talked about. If suicide is bad for humans to do, I imagine it is even worse for an angel to consider.
I really worry about the choices and interaction between Metatron and Castiel. Castiel ended doing exactly what Metatron wanted - become the villain of the story. Things are going to get a lot worse before they get better, and I hope that doesn’t damage Castiel’s self worth =(