Tip to future writers. Do not make your fan theory canon because two characters have similar hair.
Magneto's hair being naturally white is a retcon. iirc, Claremont said that it went white because of the shock associated with being buried alive. but it's not like he had white hair as a child (at least the first childhood).
Kraven's Last Hunt still happened. Hunted has referenced it more than once. this one just builds upon the original story.
It doesn't really, the story is one big valentine to how awesome it was, it hammers home the nods insistently, and it's kind of annoying and actually subtracts originality from the story it's been trying to tell.