We have even more evidence for deltarune prime theory (it’s not popular I came up with it myself)

The deltarune prime theory is that the game we are playing isn’t actually the original world Sans came from but a different one that Sans somehow traveled from undertale to. As we know the undertale and deltarune timeline is a complete mess they are both sequels and prequels to each other at the same time somehow here is where my explanation comes in it’s like that because the original world is one where the roaring happened no one was able to stop it Sans escaped we know Sans traveled from a deltarune to undertale, but chapter 5 gave us evidence for undertale coming before deltarune somehow with the 2g line implying Normal npc came from undertale to deltarune likely the same exact goner we meet in undertale but coloured in with care. Also don’t forget that throwaway line in chapter 1 where we can say it’s great to see you again which would be weird for Kris to say but not us as the events we’ve seen in undertale come before deltarune somehow.