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Zoro is forging 3 supreme grade blades. Unless a black blade automatically jumps the blade to supreme status (which there is no evidence for) he is replacing sandai at some point. Nidai seems like the most likely candidate

Maybe Zoro gives sandai to momo so he can learn nitoryu like his dad and tengu gives him nidai. I don't see a problem with the color change, zoro's ryuo was purple until King of Hell. Two purple swords + wado is fine by me