Uchiha Yi and the others had no idea that three Ōtsutsuki were heading toward the Shinobi World.
Of course, Uchiha Yi wouldn't have cared even if he'd known. He might even have applauded. After all, they were delivering themselves right to his door!
Madara Uchiha was already on their side, and Yi had killed Ōtsutsuki Isshiki. Hamura Otsutsuki and Hagoromo Otsutsuki had initially been enemies in Yi's mind, but as it turned out, they had reached an unspoken understanding with him. As long as Yi did nothing to harm the Shinobi World, they were willing to work with him.
The brothers, Hamura and Hagoromo, probably believed Yi had achieved Atavism with the help of this planet, didn't they?
Otherwise, there was no explaining how Yi could have grown so powerful.
And Yi really had helped the planet by eliminating the unstable factor that was Isshiki. Now he even seemed intent on taking the fight to the Ōtsutsuki stronghold. It was outrageously audacious, but perhaps not unacceptable.
Over the next stretch of time, the entire Shinobi World descended into turmoil.
For reasons unknown, the Land of Water and Kirigakure declared themselves closed to the outside world. Ninja from other countries were no longer welcome in the Land of Water.
The other countries found nothing suspicious about it. The Shinobi World was in chaos, after all. Perhaps the Daimyō of the Land of Water feared Kirigakure might pick up some dangerous new ideas and do away with him.
The Land of Wind, meanwhile, plunged into outright civil war. The Daimyō of the Land of Wind had indeed been stingy with Sunagakure, even cutting its funding from time to time, but he still enjoyed considerable support throughout the country.
More importantly, the Third Kazekage had wiped out the Daimyō's entire family!!
If Sunagakure