Although he thought so, the Totsuka Blade was not something that could be found easily. Orochimaru had searched desperately without finding the slightest trace of it, only to discover the blade he had dreamed of in his enemy's possession. Kazemori Masaki suspected that clues to its whereabouts lay in the Uchiha Clan's records. The odds of Uchiha Itachi, a rogue ninja also carrying out espionage duties within Akatsuki, stumbling upon the Totsuka Blade by chance were extremely low.
Once the fighting dies down, I'll discuss this properly with Kagami.
Kazemori Masaki planned this out in his mind. What Kagami Uchiha had experienced during that time also gave him an opportunity to reveal some information about Black Zetsu. Before, he had struggled with the fact that no one knew the truth. Even if he spoke up, they might dismiss it as a joke.
But now, Kagami Uchiha had seen Black Zetsu with his own eyes, and Kazemori Masaki knew that he had learned from Madara why he had left Konoha Ninja Village. With these facts, they should be able to offer evidence of Black Zetsu's existence that others would believe. People were always more inclined to trust what they had witnessed themselves.
Once more people knew these secrets, Kazemori Masaki would no longer be fighting Black Zetsu alone. It would not be so easy for Black Zetsu to exploit the chaos again. No matter how elusive he was, as more and more people searched for him, he would become a turtle trapped in a jar, certain to be caught sooner or later.
Moreover, Kazemori Masaki could work with others to devise a plan, lure Black Zetsu out, and settle the matter in one decisive stroke, eliminating the threat for good. After that, Kaguya Otsutsuki could never be resurrected. No ordinary person