After killing Hanzo, Akatsuki's trio not only took over all of Amegakure's forces, but also inherited every last one of Hanzo's legacies!
Among those legacies, the most valuable were Ibuse's summoning scroll, ninjutsu scrolls, and the method for transplanting Ibuse's venom sac!
If those three inheritances were combined, they could completely create a top-tier combatant just like Hanzo.
Of the three, the crucial core was undoubtedly the venom-sac transplant surgery! Only with a venom sac could one learn and use Hanzo's secret poison techniques, become immune to the venom of the summoned Ibuse, and thus unleash strategic-level power comparable to a Tailed Beast. Otherwise, even if Hanzo had reached Kage-level, he would at most have been a taijutsu powerhouse like the Third Raikage, capable only of fighting alone. He could not have stood against an entire Shinobi Army by himself or suppressed an entire nation.
Nawaki's method for rapidly increasing Yahiko's strength was to have him undergo the transplant surgery, inherit all of Hanzo's legacies, and become the new demigod!
Although Yahiko was less gifted than Nagato and Konan, who had cultivated and developed the secret Paper Release techniques, he had been trained by Nawaki and Jiraiya since childhood, giving him an extremely solid foundation. Becoming a jonin in his teens already qualified him as a genius shinobi. All he lacked was a trump card, and Hanzo's inheritance happened to make up for that weakness. Moreover, Yahiko himself was already proficient in the Konoha Six Powers, so he did not need to learn Hanzo's Six Powers and Body Flicker Technique. Combined with Qi-Refining Pills that increased his chakra reserves, all these factors could let Yahiko soar to the heavens in one step and rapidly gain strength comparable to Hanzo's.
When Nawaki told Yahiko his plan, this pacifist who had devoted