So, we all know about the parallels between undertale and deltarune and specifically how deltarune is undertale in a reverse order (like how card castle is supposed to represent asgore's castle, cyber city represents the core, tv world represents hotland since both mettaton and tenna are show stars that terrorize the main character/charcters and the dark sanctuary is like waterfall) but looking at a bigger picture i noticed something aside from how things are going the final location of chapter 5 most likely will represent snowdin town/ forest in a way

so to put this theory together a bit more it is also apparent that kris has parallels to chara and frisk and the things in common are
frisk: simmilar skin tone and being under the player's control
chara:is the adoptive child of toriel and asgore, and possibly both seem to hate humans in the sense of of the situation they are in where they are the only human in their area being caused by them in some way

susie also reacted very much in denial about that part of the prophecy which she broke before we saw it and said that she wont let it happen
now i already believe that part of the prophecy doesnt state about closing the grand fountain since it states "to save BOTH worlds there is only one way" now claiming that saving both worlds by literally earasing one out of existence would be just illogical so here is what I am getting at

since susie reacted in denial, and kris represents frisk+chara in a way, and deltarune is a reverse order of undertale this means that the prophecy is referring to kris's death and here is how i'll explain it
so in the beginning of undertale the literal first location is chara's grave so in the last location of deltarune it could be kris's grave further slightly proven by the fact that kris is a representation of frisk+chara it is plausible that kris may want to save the people they know just like chara did and if we go by the player is the angel theory kris will try to banish us but since we are the soul that keeps them alive this would lead to their death this would explain why susie wants to stop that but since gerson said that susie holds the white pen that will rewrite history she could stop that somehow i dont know how but maybe it could happen