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But there are shinobi who are yin types that do not have a sharingan. Take Shikamaru, for example, his shadow extension jutsu is yin type but not a sharingan jutsu. Its the brain that makes it possible to awaken a sharingan and that is a genetic trait.

You do have a point about the whole spiritual energy thing. Before becoming the ten tails the chakra tree would only absorb negative energy. Then it produced a sharingan.

Nice fanfic