I've found the book relatable because I've gone through a similar mental processes in life without intentional design. It might not be a new theory (I haven't discussed the book with anybody yet) but Ender wasn't genetically engineered or whatever, he's based on the role models that were his brother and sister, and they may have been conditioned to be that way because Ender needed to internalize these two examples as a moral guide, and so they may have been created intentionally (if further books expose it I'll feel stupid for a few hours, but whatever). Peter emulates this strategy by adopting a softer online role and giving the more radical one to his sister, and they both built up what was missing from their personalities, becoming as "complete" as Ender.

In the nature vs nurture argument it would mean that these kids only inherited the mental bandwidth necessary to become genuises, and the rest is nurture.