Is it not possible that the rule was more like, If any of your forefathers chose the fate of Mortal Man, you are bound to their decision? This makes more sense to me, since a mortal could never birth an immortal, and one would have to be originally immortal to make the decision. All those who had the choice were born immortal (and had immortal mothers) and then opted for mortality. It's like a step you can only descend and never ascend. Make any sense?
I may be missing something, but I think the history fits with this concept.
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