Aaaah, your Casey is exactly, spot on the way I look at him. He just doesn't push back all the time, because he choses not to, but once you've a crossed a line with him, he's stronger than any of them. In this case even too strong for Zeke to take.

And what you said to Alch; yeah... Casey blew it with Zeke here, and he knows it. Sentences like these: And Casey smirked and tried to feel superior, wondering if Zeke felt this empty and stupid and frustrated whenever he wore this superior look on his face. make me bounce in my chair for the cheer 'yes, yes, YES!! That's exactly how it feels when you win the wrong part of an argument!!'
It takes something big like an alien invasion to sort this. Lucky for us we know there's going to be one.

So uhm, yeah, I really loved this fic rather thoroughly.