So I think the reason Toriel wasn't supposed to wake up in Chapter 3 was because then she'd know Asgore was right.
Asgore knows about Dark Worlds as he was in the shelter when he was trying to save Dess but failed.
Kris was likely in the shelter at the same time and Asgore, one way or another couldn't save both.
Kris traded the Vessel his red headband for the SOUL and likely feels guilty for Dess' disappearance because she likely went in before Asgore to save Kris (likely feeling responsible for his safety)
We're going to get the police code to the shelter from Asgore or at least his shop since he used to be police chief and its unlikely they changed the code.
When we enter the shelter in either route, we're very likely to bring Noelle with us.
To help Kris save Dess in the normal route or to help US reunite with our Vessel in the weird route

I am 100% convinced our lack of options in this scene is because we briefly broke off the path laid out by the prophecy.
The prophecy dictates what we can say whilst on the path which is partly why the prophecy supposedly comes true no matter what we say or do.
That is until we find a loophole and force Noelle to be our puppet, as to what end however, we dont know yet.
Our lack of options here is because the prophecy, like a computer program, doesn't know what to give us as options.
Susie was never supposed to ask us "what we were talking about" effectively knocking us off the path, but then she doubled back and joked about it, landing us back onto the path.
Kris is called the "Dark Bead" in chapter 4 weird route and it states "broken off but still locked" which is what im using to support my theory that we created an opening to subvert the prophecy but we have yet to make our move.
I have a feeling we're going to have more scenes like this going forward since we're subverting the prophecy and it doesn't know what options to give us.
Assuming I am correct, that means the soul is directly connected to the prophecy which may or may not be a program of sorts similar to how undertale was just a game program that Asriel and Kris made as kids on their computer.

This is the most mysterious moment of ch4
What does it even mean?