Yeah. I love the kink, but that written mark variation for identification just makes even less sense as workable in any way, and it always bugs me when I read that kind of AU. I can go along more easily with himans feeling some psychic pull toward their soulmate, or even some matching symbol. Though oddly enough you see that much less often, no matter that it seems much more straightforward. Like both soulmates show the same star constellation pattern in the same spot as birth mark or something. There is an infinite number of dot arrangements for possibility and you could match those without knowing writing.