Don't get me wrong, I really like Moriya as a character. I've also mentioned before that she's my favorite side character so far, but I just can't help but nitpick the development in this episode. To be fair, while there are quite a few scenes featuring Moriya, there simply isn't enough buildup to suddenly give her such a significant presence in the main story. The development just feels too sudden, in my opinion. That said, that's just a nitpick of mine. If we take the off-screen events into account, then it makes a lot more sense.