Theories for next episode: Sonar and Lilly are very likely planning to hurt/kill Nest in front of Bew to make him suffer even more (how is he still alive anyway? No way he'll last one more episode).
I also believe that Lyla must have been way meaner that what we've seen so far and the sneak peek we got today was just a taste. She did say she was tired of playing the good girl, so there has to be more. Yes, it seems like she never did much to Sonar other than the whole Olympics thing but I think a lot of Sonar's hatred for her comes from how much she seems to care for Lilly. They appear to be very very close and they're both Bew's victims so it makes sense that now they're fighting together even though Lyla wasn't as mean to Sonar as she was to Lilly.
Ken is still missing, hopefully he'll turn up at some crucial moment and change things up. I like the Bozo/Gel truce, they've both just lost their closest friend and they're simply exhausted. I really hope they make it out alive. Yes, Gel was very mean to Lyla but compared to Bew it doesn't seem like she deserves the same fate. Plus if Lilly is running everything being mean to Lyla is a positive lol
The preview showing that Lilly was trying to imitate her sister is probably a hint to the Lyla sightings on the island being just Lilly, but it might also be there to throw us off? There's three main reasons why I still have doubts about Lyla not being just Lilly imitating her: the episode where Lilly faked her death and saw Lyla in the woods, the fact that Gel saw Lyla after we got the reveal and she was in a different part of the island, and the fact that Lilly knew Bew was only hurt and not dead despite what we saw Lyla do to him. I still think that was actually Lyla and Lilly only sliced his fingers. It felt like Sonar and Lilly were expecting more of a fight and he's already on the brink of death.
Also, Sonar saying that she killed Plato when it was shown that she was standing with everyone else was a bit confusing. I assume it was Lilly who did that, so it's interesting that they refer to each other's kills interchangeably as a real team. I don't see them splitting up for separate goals unless something major happens. Splitting them up might be a way to end it. They seem to be the only people who are still bloodthirsty other than insane Ken looking for revenge (and Bew if he wasn't dying?).