That's all well and good; but you've got two orphans with unexplained superpowers ---- one who runs faster than a fighter jet in flight, and the other who's a witch. Despite this being set in an evolving superhero universe, audiences will still wonder who, how, what, where, when and why. They're not going to accept "they were born this way."
I'm quite happy for those questions to be left unexplored initially, not tying down who their father is, or their origin, leaves doors open should Marvel studios decide to use them further down the line.
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