"The other villages might not dare to act, but Konoha certainly would. After the previous war, the other villages have actually already banded together in secret. If Uchiha Yi makes another move, everyone will target him.
"We could stir up trouble between Konoha and the other countries." After some thought, Black Zetsu suggested to Madara Uchiha, "By the way, I've been investigating the history of the Warring States Period lately, and I discovered a very interesting figure."
"Oh? Who?" Madara Uchiha trusted that Black Zetsu would not bring this up without reason. He must have discovered something interesting.
Could there actually be a way to help us defeat Uchiha Yi?
"Lord Madara, how much do you know about the Uchiha Clan's war weapons?" Black Zetsu did not answer directly, asking a question of his own instead.
"War weapons?" Madara Uchiha frowned. He held nothing but contempt and disgust for those so-called war weapons. "If someone with exceptional talent, perhaps even the potential to awaken the Mangekyō Sharingan, had no one to protect them, the clan leader of the time would repeatedly brainwash them before they could mature. They would try to turn them into weapons of the Uchiha, war weapons who obeyed only the clan leader and fought for the Uchiha.
"When I became the Uchiha Clan Head, I abolished the practice.
"Don't tell me the Uchiha have started creating war weapons again?"
Madara Uchiha had confidence in himself. He would undoubtedly be the strongest, so war weapons were entirely unnecessary. If someone in the Uchiha Clan truly could awaken the Mangekyō Sharingan, he would have a way to make them submit to him.
As for those so-called war weapons, only cowards would resort to that. He, Madara Uchiha, certainly would not.
Ultimately, it came down to fearing that those