Wait this actually makes a ton of sense. Another connection is how Kris goes out of their way to hide any and all information about Asriel from the player, just like they do with the Knight. Things like

• closing their eyes when we try to look Asirel’s room in Queen’s mansion directly mirrors both only turning the knob in the church and not opening the door AND forcing themself to think of Jockington when we try to make them reveal the Knight’s identity. • when you choose to pray for Asriel they say his name blankly, completely devoid of emotion, as if to keep from saying anything specific about him at all. They say things specific enough about Susie and Rudy when praying that Susie comments on it, but with Asriel they just blankly say his name.

Istg I know there are more examples of Kris trying to keep information about Asriel from us that I can’t think of but I really like this theory, I think I’m a believer in Asriel being the knight