What were Black Zetsu and Obito Uchiha worrying about?
What was giving them such a headache?
The problem of sealing the Nine-Tails, of course.
Nagato's operation had failed, and he had died as a result.
The problem now was that, regardless of what had happened to Nagato, the Nine-Tails had to be sealed. Otherwise, the birth of the Ten-Tails would be nothing but empty talk.
But with Shihōin Naraku around, Black Zetsu and Obito could not figure out how to seize the Nine-Tails and seal him.
Yet they could not simply leave it undone!
That was why the two found it such a troublesome headache.
Shihōin Naraku stood squarely in their way, leaving Black Zetsu and Obito unsure how to proceed.
Actually...
Black Zetsu had not voiced what was on his mind yet. He thought it was not the right time.
Besides, even if they followed his idea, Shihōin Naraku would still be an enormous problem. Without finding a way to deal with him, there would still be no hope of success.
As for the plan Black Zetsu kept hidden, it was, of course, that the Demonic Statue of the Outer Path did not need all of the Nine-Tails' chakra to awaken the Ten-Tails.
With all eight other tailed beasts sealed inside the Demonic Statue of the Outer Path, even a tenth of the Nine-Tails' chakra would be enough for the Ten-Tails to be born.
But even if they did not need to seal the Nine-Tails completely, it would still be a problem.
Black Zetsu did not believe Shihōin Naraku would simply watch them devour the Nine-Tails' chakra, even if the two sides were secretly cooperating.
There were some things Black Zetsu understood Shihōin Naraku's stance on even without bringing them up.
So, to obtain the Nine-Tails' chakra, they still