Looking at Amado and Orochimaru as they reported to him, Shinji's expression tightened slightly. "All the experiments with White Zetsu Clones failed?"
Amado nodded. "Yes. White Zetsu Clones can't withstand the power of shinjutsu. No matter how many times we repeat the same experiment, we won't get anywhere."
Shinji asked, "Do we have to experiment on ninja?"
Amado sighed. "At this point, it seems we have no other choice."
Given enough time—ten or twenty years, for example—he could start with animal testing and gradually analyze the cellular properties of Ōtsutsuki Shibai, making it possible to identify suitable candidates for cell transplants more efficiently.
But there was no time!
After a moment's thought, Shinji asked, "How many ninja will we need?"
Amado shook his head. "There's no way to know yet. If we're lucky, one person in ten might meet the criteria. But if we're unlucky, there might not be a single suitable candidate among a hundred, a thousand, or even ten thousand ninja."
Orochimaru smiled. "There's no need to be so pessimistic. Ada and Daemon are proof that other suitable candidates should exist in the Shinobi World. We can start with their backgrounds and search along their bloodlines for others."
Amado shook his head again. "I already tried that. Ada and Daemon were both orphans adopted by Ōtsutsuki Isshiki. Their parents died in the Third Shinobi World War, so it's difficult to trace their family bloodlines."
Don't think the Shinobi World was peaceful. It was only the Five Great Nations, under the protection of the Five Great Shinobi Villages, that enjoyed relative peace.
Even the Five Great Shinobi Villages had endured the calamity of four Shinobi World Wars. So it was perfectly ordinary for a family or bloodline to be wiped out in a war—or even a single battle.
Shinji