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I can forgive Die for not noticing it, but I can't believe no one has mentioned the biggest thing to happen in this episode: we got the first appearance of Tsurugi's pronunciation of Kagami's name. It'll get more exaggerated as we go on, but it started here.

So, one thing I'll say about the Hiyori reveal is that it doesn't feel like a retcon or something that the writer threw in out of nowhere. It does fit with a lot of the earlier interactions between Tendou and Hiyori and why Tendou was so insistent on forcing his way into this otherwise random girl's life. It also recontextualizes the scene from a few episodes back where Kagami's dad vaguely threatens Tendou's little sister - he was talking about Hiyori, not Juka.

So I actually like the twist in how it makes sense when retroactively applied to the rest of the series. The big issue I have is with the execution, especially when we get to the later stuff with the Tendou in the Iron Mask. I don't doubt that this twist was planned from the start, but the timing and execution are things that I have some real concerns with.

So, as was spoiled earlier, Yui Satonaka, aka Hiyori, got sick and couldn't continue working on the show full-time (you may have noticed that she's been largely or entirely absent from a lot of recent episodes). I'm sure that the Worm reveal was planned for some point, but I don't know if it was supposed to happen now or later. All the stuff with Tendou-2, though, definitely feels like it was crammed into the episode because the show needed to a) act while Hiyori was still available and b) find a mechanism to write her out.