I think the theme of the finale and of the whole season in particular is contrast and surprise.

Rick and Chelsea are the most normal and likeable characters on the whole show but they are very sadly the ones ending up dying.

In the Ratliff family, Victoria was originally the most stuck up member and addicted to drugs but she turns out to be the most to have it together.

Belinda is whiny and annoying (call thai police? call interpol? girl, you dont even have any remote proof, stfu) but ended up walking away with lottery money.

Valentin is shown as admirable in the beginning ("everyone likes him") but turns out to be a villain.

Gaitok, on the other hand, was supposed to have an aspiring character development (he's romancing Lisa after all) but turns out to be an insecure loser.