We get some final verbal sparring from the two of them. I wanted to do this to give a nod to the earlier portions of the book; we haven't gotten this from them in quite a long time. However, I also wanted it to feel forced. I was tempted to rewrite this scene a couple of times until the most amusing lines in the book came here, in this chapter, but in the end I chose to go for something with a little more tension in it. Something that felt contrived, like they were trying too hard—which, indeed, they are.
Beyond that, outside of the banter, they both make some very astute comments—and I think their wisdom in the moment undermines any random joking. Lightsong mentions how ridiculous everything is, and can finally point out and prove what he's been saying all along—that the rest of the pantheon is more useless than he is. Blushweaver, however, probably makes her most astute comment in the book by explaining to Lightsong just why everyone looks up to him so much.
You set yourself above them, Lightsong, and through your mockery—which they know to be true, deep down—you earn their grudging respect. That puts you apart from them. In a way, he's become the greatest leader of the pantheon in its current incarnation, all by avoiding contact with most of them and by being bitingly sarcastic when he does meet them.