what i think is that there are a lot of links but just one soul. So it's like reincarnations of OoT link. It's like just one link. Every time hyrule (or another land) needs help, he is reincarnated to help the land, same with Zelda.

BTW that reminds me, a friend once told me that there was more that one ganon, however i don't think this is true.

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