Black Zetsu told Madara Uchiha everything he knew, though whether that intelligence had been edited was impossible to say.
He had also omitted many of his own little maneuvers. It was originally he who had abandoned Uchiha Obito and chosen Hyuga Kei.
Yet it had been completely twisted into Uchiha Obito betraying Madara Uchiha in order to become the Ten-Tails Jinchuriki himself and revive Nohara Rin.
Black Zetsu had been forced to continue the Moon Eye Plan with Hyuga Kei, but Hyuga Kei later betrayed the Moon Eye Plan because of two women.
He had tempted Kabuto Yakushi into finding Uchiha Obito and Second Pillar to continue the Moon Eye Plan.
Black Zetsu never mentioned that Hyuga Kei was actually his collaborator now.
He wanted to exploit the information gap created by Madara Uchiha's recent revival and lack of knowledge about the current world, placing bets on both sides and currying favor with both.
Madara Uchiha, meanwhile, did not notice anything unusual in Black Zetsu's words. He had never doubted Black Zetsu, believing that since he had created him, Black Zetsu was the embodiment of his will.
Because of that, he had never suspected Black Zetsu of lying.
"The Tenseigan... a ninjutsu that steals bloodlines... the Ninja World Federation... How interesting. This Hyuga Kei is worthy of being my opponent." Madara Uchiha regained his imposing aura.
"Yet the facts have already proven the failure of his Ninja World Federation. The Moon Eye Plan is the only way out for the ninja world."
Hearing Madara Uchiha's words, Black Zetsu said with a smile, "That's right, my lord. Everything is still within our grasp. Second Pillar and Uchiha Obito are useless, but we can first have them gather all the Tailed Beasts for you. We only need to wait for the right