Think about it, BZ is known for praising the Solo King:
And now Black Zetsu is cloaked in the Akatsuki uniform since he is a former member of Akatsuki and he is trying to use Sasuke's powers to revive Kaguya again. Since he loves Itachi, he makes his clone with the sharingan loathe Sasuke for killing Itachi when the clone did not even know Itachi personally.
It's not Obito since he died. It's not Madara. SO it has to be the mastermind behind ALL of them, Black Zetsu.
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And now Black Zetsu is cloaked in the Akatsuki uniform since he is a former member of Akatsuki and he is trying to use Sasuke's powers to revive Kaguya again. Since he loves Itachi, he makes his clone with the sharingan loathe Sasuke for killing Itachi when the clone did not even know Itachi personally.
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It's not Obito since he died. It's not Madara. SO it has to be the mastermind behind ALL of them, Black Zetsu.