Black Zetsu felt he needed to observe Uchiha Yi again.
He had never thought Uchiha Yi would cause trouble for his plans. The boy was merely a somewhat gifted Uchiha, and Black Zetsu had seen plenty of such talents over the centuries.
But Uchiha Yi had no siblings, so he had no way to awaken the Mangekyō Sharingan. The Uchiha Clan's bloodline had declined so far that awakening it had become difficult. Even someone who managed to do so would have to find a way to restore his sight by merging his eyes with another pair of highly compatible Mangekyō Sharingan.
Uchiha Yi actually had access to such a pair: Kagami Uchiha's eyes. But those eyes were in Madara Uchiha's hands, and they would never reach Yi. Even if Yi awakened the Mangekyō Sharingan someday, and another Uchiha of this generation was lucky and talented enough to do the same, Yi still could not attain the Eternal Mangekyō Sharingan.
No one had ever tested it, but Black Zetsu understood the Uchiha better than anyone in the world. If two pairs of Mangekyō Sharingan were incompatible and could not complement each other, they could not produce the Eternal Mangekyō Sharingan.
In fact, at the beginning, there had been no such thing as the Mangekyō Sharingan, let alone the Eternal Mangekyō Sharingan.
Uchiha Yi had barely left Konoha for the past two and a half years, leaving Black Zetsu unable to keep an eye on him. Until now, Black Zetsu had no idea how strong the boy had become. But Yi's defeat of Hanzō was impossible to ignore.
A ten-year-old Uchiha had defeated Hanzō. Had he already awakened the Mangekyō Sharingan?
And was Uchiha Yi connected to Indra? Black Zetsu's gaze drifted toward Madara Uchiha's eyes. Once Madara died, could he guide