For the past thousand years, Black Zetsu had never had a chance to confide these worries and frustrations to anyone else. Now, by chance, he vented fiercely to his fourth brother, Gray Mysterious, recounting all the strange cases of Indra and Asura reincarnates he had encountered over the millennium. Compared to them, Madara Uchiha was already the most outstanding Indra reincarnate of all generations. In other words, Madara Uchiha was the flower most similar to the original Indra. Black Zetsu had placed great hopes on him, which was why he remained especially bitter about Madara Uchiha's momentary carelessness back then—losing the Nine-Tails after obtaining it, and being forced to delay awakening the Rinnegan by several decades.
Black Zetsu had not felt it before, but after venting so freely, he realized just how lonely he had been in the past. He had not even had anyone with whom he could speak honestly.
Now things were different. He had his fourth brother. His fourth brother was Mother's incarnation sent from the future into the past, and judging from his tone, he was even more worried than Black Zetsu about the signs that the "butterfly effect" was causing events to gradually slip out of control.
His fourth brother was such an honest, dependable person!
Black Zetsu's heart eased, and he transmitted hoarsely, [It's nothing. Sasuke and Naruto are Indra and Asura's reincarnates, so they were bound to grow stronger anyway. As long as they do not become as strong as they were when they fought Mother in that final war of the future, there is nothing to worry about!]
Gray Mysterious sighed through their mental link. [But—sigh! I'm just afraid of delaying Mother's great undertaking.]
Black Zetsu said, [Sasuke and Naruto have grown stronger ahead of schedule, but our progress in gathering the