From god's eye view, Hyuga Yu had made the same mistake as Kirigakure: he had not vetted the intelligence rigorously enough.
It was a kind of arrogance—the arrogance of being overly certain about established facts. Relying on his knowledge of how the future plot unfolded, Hyuga Yu had tried to apply past experience to a world that was constantly changing.
Based solely on the fact that there had been no major event related to "Explosive Tags" during the Third Shinobi World War in his memories, the overall direction of the current shinobi war, and intelligence obtained from Root, he had readily believed the "false" intelligence that Konoha was not stockpiling large quantities of Explosive Tags.
Root had no reason to deceive him. In other words, this incident had in fact fooled even Root.
Hyuga Yu had no intention of making excuses. On the contrary, this reckless advance had dealt him a fierce slap across the face. As his face flushed and his heart raced with shame and embarrassment, Hyuga Yu sharply realized—
His mindset had become somewhat "carried away."
When had it begun?
As he moved swiftly through Nameless Forest, Hyuga Yu rapidly flipped through everything that had happened in his mind.
In the end, the image in his mind froze on the moment he dug out Hyuga Genko's eyes and implanted them into his own sockets.
From that moment onward, it seemed that something had become misaligned in Hyuga Yu's "understanding."
In truth, he had not truly solved the Caged Bird. This Cursed Seal rooted in the soul would not disappear even through Impure World Reincarnation. His subconscious had turned a blind eye to the danger, while in reality he had unconsciously avoided discussing it through petty means—but it was still there, unchanged.
After receiving new Byakugan, Hyuga Yu