As for the outcome of Obito and Kakashi's battle...
Ye Ning didn't need to go and see.
The Double Mangekyo Sharingan was simply too ridiculous. Even with Kakashi's high battle IQ and his ability to keenly spot the limitations of Kamui, it would still be extremely difficult for him to find a way to counter it.
The only drawback to Obito's Sharingan was that it would eventually go blind.
However, Ye Ning believed Obito was well aware of that.
If he ever got close to losing his sight, Obito would probably transplant Hashirama Cells.
After all, Madara Uchiha never lacked those.
Spring turned to autumn, and time flew by.
Without Obito manipulating the Nine-Tails, the Nine-Tails Incident never happened. Kushina gave birth to a baby boy without a hitch and sealed half of the Nine-Tails inside him.
Of course, that had been Ye Ning's suggestion.
He simply couldn't imagine what Naruto would be like without the Nine-Tails. Naruto and the Nine-Tails were already firmly bound together. It would be strange if the two of them weren't together.
Naruto's birth also meant Konoha was entering a new era.
"I say, Ye Ning, you skipped the Uchiha Clan's ceremony back then, but now you're planning to attend the Hyuga Clan's ceremony... People could easily think you're favoring the Hyuga Clan!"
Tsunade propped herself up on one arm, utterly baffled by Ye Ning's reasoning.
Fugaku's younger son was born, and they went out of their way to invite you, but you didn't go. Now you're going to the Hyuga Clan's ceremony... What kind of thing is that?
"I didn't go to the Uchiha Clan's ceremony because I was away looking for Tailed Beasts! This time, the Hyuga Clan's ceremony happened while I was in Konoha, and I got an invitation.