Basically the theory says that Kris is probably gonna lose their hand, it has a pretty decent amount of evidence. (Kris couldn't find their arm in the 1225 ball machine room. Susie says "as long as kris has a hand to lift me up" when fighting the knight. Kris bites their hand hard if you say "I'll never play again" in chapter 4. And some more stuff I'm too lazy to type)