Uchiha Yi didn't know just how powerful Ōtsutsuki Isshiki was.
After all, power levels in Boruto: Naruto Next Generations were still rather vague.
Isshiki was certainly stronger than Naruto Uzumaki and Sasuke Uchiha. He was an Ōtsutsuki who had pushed them into a genuinely desperate fight.
That put him well above Momoshiki Otsutsuki and Urashiki Otsutsuki.
After all, those Ōtsutsuki might not even have beaten Sasuke or Naruto one-on-one. Isshiki, however, was clearly stronger than the two of them combined.
And that wasn't even Isshiki's true strength.
Uchiha Yi found himself wanting to fight Isshiki. Right now, no one in the Shinobi World was more worth his time.
If he defeated Isshiki—or even killed him and obtained his remains—it would benefit everyone.
If they could get hold of Shibai Ōtsutsuki's corpse, Tobirama Senju and Orochimaru could study it. With a little luck, they might even help others develop divine techniques. Anyone who mastered those would be invincible in the Shinobi World.
Yi had no intention of implanting Shibai's cells in himself or trying to develop divine techniques through research. If Shibai could reach that point, why couldn't he?
After all, Yi still had the Battle Space.
If he kept fighting, sooner or later he could reach Shibai's level.
It would be even better if he could fight Kaguya Ōtsutsuki over and over. Her raw power was impressive, but her battle instincts were too weak. To Hagoromo Otsutsuki and the others, she was immortal. To Yi, she could be killed.
Yi had a way to deal with Kaguya. Hagoromo simply hadn't possessed it.
If Kaguya truly couldn't die, she would have had no reason to fear the Ōtsutsuki Clan.
Yi had that means, and so did the Ōtsutsuki Clan.
Yi couldn't travel from planet to planet, gathering God Tree Fruit and