Chief Priest, ZUN, what are you doing? I know red herrings are supposed to be a thing in mysteries, and characters can only propose ideas based on the information they have, but we readers have knowledge the characters don't. We've seen Byakuren's possessed face, and it looks suspiciously Mima-like, not Mizuchi-like. Additionally, we have the end of the previous arc to inform us of the First Hakurei Miko. Those are our two most viable suspects because, 1) Mima is currently riding a high from ranking in the top 50 in the most recent Touhou Popularity Poll, and ZUN might want to capitalize on that popularity instead of continuing to suppress her; 2) It's clear Mizuchi still feels something for the First Hakurei Miko, so her trying to hide her existence even at the risk of incriminating herself makes sense; and 3) no other options have been established so far. Introducing an idea that would be so narratively unsatisfying to be the big twist when it is almost certainly not the case doesn't work because we've seen the better options (then again, I've come to feel ZUN has a bad habit of pissing up the nose of his oldest, most engaged fans, so I wouldn't put it past him to deliberately disregard these two options).
Also... why is this a Detective Satori story? In this recent run, only 57 of the total panels are dedicated to Satori doing detective work, she didn't even appear in chapter 3 and has spent every chapter beyond unconscious. I was kinda hoping they'd reveal she was faking it so she could tell everyone what's really going on, but this would've been the best time to reveal that, so I guess that wasn't the case...
