and currently the seal is in the possesion of Hagoromosasuke has hamura's power (six paths yin chakra)
Do you deny this ?
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Hamura temporarily had it and even then likely got it via his brother
the seal is just a creation made particularly for Kaguya since she is too OP
Ootsutski's themselves are not biased towards Yin or Yang, they wish to posses everything