[quote=@Masaki Haruna]More like is there even a living MS user? I suspect Kaido to have both Byakugan and Sharingan.
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I don’t know what Buddha’s ruling on this, but when I ran a similar RP I went by the theory that only one (dojutsu) kekkei genkai would come out genetically— basically you only have one even if genetically you descend from two clans who both hold such kekkei genkai. It makes no sense to me to have both— one would or should overwrite the other. Recessive vs Dominant genes and all that.