In truth, Shin Uchiha only knew who had come looking for trouble with Kakashi because he knew the plot. He had worked backward from the outcome to reach his conclusion. Otherwise, he would never have known that Obito Uchiha had come to reclaim the Sharingan in Kakashi's eye.
But he was the only member of the Uchiha Clan here now, so he could say whatever he wanted without anyone exposing him.
Tsunade's interest was piqued by Shin Uchiha's words. "The intruder's Sharingan and Kakashi's are a pair?"
Shin Uchiha nodded without batting an eye. "The Mangekyō Sharingan is rare even within the Uchiha Clan, let alone a space-type Mangekyo. In the entire Uchiha Clan, mine was the only Sharingan that awakened as a space-type eye.
"And you know perfectly well what dōjutsu my Mangekyō Sharingan awakened. It's just a space of its own, without a single spatial ability.
"I examined Kakashi's Sharingan a while ago. His is an extremely rare Sharingan with a spatial ability, which left me astonished for quite some time.
"Logically speaking, Kakashi has no Uchiha Clan blood, and the Sharingan transplanted into him was only an ordinary Two-Tomoe Sharingan. Evolving into a Three-Tomoe Sharingan would have been remarkable enough. It should have been impossible for it to evolve into a Mangekyō Sharingan.
"I also sounded Kakashi out back then. He thought this eye was just an ordinary Three-Tomoe Sharingan, so he probably wasn't responsible for its evolution into a Mangekyō Sharingan.
"It was only today, when Kakashi told us about the intruder, that I finally understood. Only if its original owner was still alive could Kakashi's Sharingan, through a fortunate coincidence, evolve into a Mangekyō Sharingan alongside its original owner's eye.
"And both eyes have spatial abilities that complement each other. The defensive one is with