Knight Theory Deltarune

Hello everyone, so..we are all wondering who is the knight in Deltarune? Personal opinion: Not Kris! Yeah, Kris is the "creepy kid from the neighborhood" for some reason, but hey, if I was being controlled by someone, that would piss me off too!
But this is not about Kirs. It's about this shadowy figure that you only see for a few sequences in chapter 1, in the level ????. (No idea if this has already been discussed or not). (picture 1-2)
In any case, I would like to deal with it, who that is now. Well, not Susie. The figure has the form of a human being and therefore can't be Lancer. In addition, the figure seems to have frightened Susie quite a bit / panicked her (see picture 3).
But we know who carries another, human form...: Our creation, which was taken away from us (by Gaster?) "your choices don't matter"...indirectly. We have given the figure a personality. We have given her "determination.
(image 4)
So why is the figure so dark that we can hardly see it? Well..Seam might be able to help. When we defeat Spamton and give the shadow crystal to Seam, he mentions the item "shadow mantle", a seemingly powerful item that we would need for the next battle. But... he doesn't find it. mhhh..?
(picture 5) Here you can speculate what the item shadow mantle does exactly - but a shadow mantle sounds like a good camouflage...a camouflage that works especially in the dark...
Also, here's a sentence about the original version of Deltarune's theme song, by Toby Fox: "The arrangement is really early, but I created this thinking of an animated intro for the game, similar to Wild Arms. I still see it in my head when I listen to the song.
The best part would have been at the end when everyone is running up the staircase as the silhouettes of the bosses from all the chapters show up, and the Knight, standing in a white door at the top of the stairs, turns around and looks down at them..."
(This could mean that the Knight is indeed an Individual Person..and thus is NOT Kris).
What do you think about this idea? As I said, these are just some flash thoughts and in the end the "annoying dog" will surprise us anyway. But I'm looking forward to chapter 3 and Co and I'm curious what awaits us in the end.
Translated with www.DeepL.com/Translator (free version)

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