>>725203872
In a scenario where Kris is in a time loop and knows what's going to happen, why would they lead Susie back to their house where they know Sans is fucking their mom and they're about to be completely humiliated?
Kris is surprised and ashamed in that scene, Kris is visibly taken aback when Susie decides to leave and just as surprised when she comes back to tell off Toriel and Sans, intending to jump out the window and run away with her until the voice on the phone stops them. None of this makes sense if Kris knows what's going to happen.
This is just one example, you could point to plenty of others. It's the same problem as "Kris is the Knight" theory where if you believe it you have to assume that the character is just putting on a facade at all times and never showing their honest feelings about anything.