One thing that trips me up from that viewpoint is why molly wasn’t killed, she pushed otter the hardest on day 1. I guess that would be because it would implicate otter more? But I could see this being a W/W thing, which would explain why molly pivoted to Eliza on day 2 instead of continuing the push.
I don’t want to provide far-fetched takes like these and base my entire solve around them, just going to leave this here as a reminder (I said this before).