"...So that's what Susanoo is. Heh, now that was an eye-opener."
In the tranquil village of Konoha.
Director Yamada was currently immersing his consciousness in the Alaya system, observing every development on the northwestern battlefield through Fugaku's own eyes. Bright Mirror stood beside him, continuing to work with tireless diligence.
In truth, compared with the blood-drenched battlefield, what the two cared more about was the strange ability of Susanoo, which was still undergoing constant evolution and analysis!
—When Director Yamada had operated on Fugaku before, he had experimentally altered the young Uchiha clan leader's Mangekyō abilities.
At the time, Soji had discovered that once an Uchiha awakened the Mangekyō Sharingan, they would draw two special abilities corresponding to their left and right eyes from soul fragments that normally lay dormant. In fact, the number of candidate abilities in every Uchiha's latent "skill library" was far greater than just two.
Or, more precisely, the abilities expressed after awakening the Mangekyō were merely the two among numerous Mangekyō abilities that best matched the user's soul wavelength at that particular time. They were not a fixed pairing determined from the moment their "character was created."
That explained why known Mangekyō abilities showed no apparent hereditary pattern, yet Sasuke and Itachi had ended up with abilities that were remarkably similar.
After all, these brothers, cursed by revenge throughout their lives, had been tightly bound together by fate through every stage of their souls' formation. Sasuke's Mangekyō had only formally awakened after he learned the modified "truth" from Obito, so it was hardly surprising that they "shared" Amaterasu.
It was precisely under the guidance of this theory that Director Yamada had been able to find suitable replacement parts among Fugaku's soul fragments, respec and allocate points in one smooth motion, and successfully modify his original