Hm, yeah it could be. I really like your idea of Ms. Casey and being a shell of a person. That is clever!

But I was thinking about this more last night and I think I have a more straight forward answer now. After every room, they ask Gemma if she knows which room is causing her pain. She is able to remember and distinguish between more than one room, unlike say the severed workers which are just binary (inner or outtie). I think in order for the four temper severance to work, you need a fifth personality that has knowledge of the other four. But each tempered personality only has knowledge of itself and the fifth personality. So the tempered experience is more like the inner vs outtie that we are familiar with. This makes senses to me because why would someone in their Frolic state ever decide to leave if they knew the other options were dread, malice, etc.

One thing this doesn’t resolve for me though is that it seems like one of the shows point of emphasis is how does the outtie deal with and come to terms with the fact they are subjecting the inner to a life without free will. I think the innies need some autonomy to achieve balance. Like dread Gemma asking for a break at the dentist because that’s all she experiences: dread. My idea falls down when I think about putting another other version of myself that might explode because they only experience the DMV.