Deltarune is a very big Interest of mine!! In my opinion, the whole "gaining control of Noelle" theory is all but guarenteed, considering the themes you covered, as well as that one spooky moment in chapter 4 where you're given a choice box with 3 empty options. I subscribe to the theory that since the question was indirectly aimed at both Noelle and Kris ("what were YOU TWO doing in there?"), the choices you're given are from Noelle, but since she didn't even hear the question, no options are actually generated. I honestly think Tricky Toby has something much wackier than just "fight Kris, Susie, and Ralsei" for the final boss, and my guess is that weird route won't even be able to finish Chapter 5 or 6. This is based on the throwaway line from Noelle about softlocking the game and wandering around a void for hours, and it could be 100% wrong (or a bit of a jerk move on Toby's part if you had to replay the entire game just to get to later chapters), but MAN would it hit SO hard. I really wish I could experience it first-hand, but I struggle to beat Spamton NEO even on the normal version with 3 party members.