Munemasa Hyuga told his son the top-secret knowledge passed down orally through their clan leader's lineage, as well as the path ahead. He had thought of this on his way back. If it succeeded, his son would gain power surpassing that of the First Hokage.
Only then could the Hyuga Clan be protected and spared further harm from that lineage. Otherwise, his son's life would very likely be their next target.
At the same time, Black Zetsu, hidden in a shadow inside the room, smiled in satisfaction. This was the idea he had secretly implanted while bringing Munemasa Hyuga back.
If Munemasa Hyuga's Byakugan had still been intact, it naturally would not have been easy to tamper with him. But his Byakugan had already been taken by Ōtsutsuki Sari, so he naturally could not detect what Black Zetsu had done.
This was the profundity of chakra. Hagoromo had used chakra to connect everyone's thoughts back then, so he could naturally influence another person's mind and consciousness through chakra as well. That was also the essence of genjutsu.
This would allow him to draw out the many contingencies Hamura had left behind. Although it would make things troublesome, visible methods and enemies were far easier to deal with than those lurking in the shadows.
Seeing that the performance here had been settled, Black Zetsu went to Root Base and checked Root's intelligence from recent days. He soon found something useful.
"They're searching for members of the Uzumaki clan who left their homeland. Is this preparation for a new Nine-Tails Jinchuriki?"
Black Zetsu made a few guesses. Konoha needed a new Nine-Tails Jinchuriki. Although the Land of Whirlpools' strategic plan had failed, that did not mean the Land of Whirlpools was the only place in the world with members of the Uzumaki