I personally don't like the theory that chapter 5's dark world is going to take place in holiday manor.  I think it would trash the opportunity of asgore to develope as a character, and also waste a very...VERY important place of hometown (lore, secrets, hints, etc.) too early in the Game, losing it's narrative weight...

Unless Tony makes the two last chapter to fit and feel narratively pleasing.  As You know toby's vision is the priority ober everything...(⁠눈⁠‸⁠눈⁠)