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What made me realize it really quickly was Gerson knowing he was dead and recruiting enemies to his room. Since Kris and Susie suspiciously have their own bed rooms in castle town, expecting to remain there.
I figured that Ralsei’s guilt comes from a different place in that their lives will be taken away to be the audience of “fake people” like him. Away from “real people”, the lighteners. Since initially, Ralsei wanted to give Kris a room that is like his bedroom in Toriel’s house, but then he decided to do this for some reason.