Back when the Five Great Nations still existed, Obito and Black Zetsu hadn't been nearly this powerful. They'd needed to develop Akatsuki and weaken the various villages. Now that the world was unified, they were supposed to go capture the Tailed Beasts?
They'd be beaten so badly they'd shit themselves.
So—
Black Zetsu had no choice but to make a decision.
With Obito and the forces he currently had, gathering the Tailed Beasts was all but impossible.
Only someone stronger could do it.
And that person was Uchiha Madara.
The original plan had been for Obito to gather the Tailed Beasts for Uchiha Madara, then revive him.
Once revived, Uchiha Madara would immediately fuse with the Tailed Beasts and become the Ten-Tails.
That should have been the safest way.
It was true that Uchiha Madara could gather the Tailed Beasts very quickly himself.
But the moment he appeared, the entire Shinobi World would rise up against him. The whole world might even unite to fight him, and his efforts to collect the Tailed Beasts would inevitably be obstructed.
That was why Obito had been gathering them in secret.
But now, since that approach wouldn't work—
Uchiha Madara would have to carry out the plan by force.
At that moment, Black Zetsu was clinging to Nagato, staring coldly at Kushina Uzumaki.
Samsara of Heavenly Life had already been performed. Uchiha Madara had now been revived.
Nagato had outlived his usefulness.
All Black Zetsu had to do now was protect the Rinnegan and wait for Uchiha Madara to arrive.
The two people who had awakened the Mangekyō Sharingan had nearly exhausted their strength, so there was little need to worry about them.
The only one Black Zetsu considered a threat was Kushina Uzumaki.
Even so, Black Zetsu wasn't the least bit worried.