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Well, they were at war for the longest time, which probably got him curious regarding the Uchiha eye techniques. For that matter, the Uchiha might have wanted to know themselves, if only to see if there was a fast track method to unlocking their power, giving them a stronger army. Once the Leaf Village was founded, I'm sure there were still cases of Uchiha's giving in to their emotions and losing control. When they were killed, they may have performed a medical examination to determine what they could. It might not have been as sophisticated as what could be done in the present-day Naruto world, but Tobirama isn't an average shinobi either.
Originally Posted by Zero