I had a whole line of explanation for why I thought Sari was guilty that never came to light, since she was a townie
If you’d like to hear it:
Sari was being super adamant that Dedenne was the killer, despite it being somewhat possible that he was being framed. Plus, I feel like she was only pushing for the cop reveal because she or another was bracing to shoot them upon announcement. (Keep in mind the Illusionist is still out there).
I’m pretty sure that Shiny is guilty as well since Sari has defended her so often. Otherwise, I have some mild suspicions for Zoska because she’s one of the other people Sari never called out. (Although Ho-Oh and Radi were both called out due to inactivity)