Earlier, Obito had transplanted Madara's Rinnegan into his left eye socket, so two Rinnegan should not have appeared on Hashirama's face on his chest. Here is a patch for that bug: Obito had first transplanted both eyes into Hashirama's face, but they felt awkward to use, so he later moved the left one into his own eye socket. As for why his left eye was restored to the Kamui Mangekyō Sharingan rather than the Rinnegan, the explanation is this: by Amenotokotachi's judgment, the left Kamui Mangekyō Sharingan was superior to a single Rinnegan.
Taking advantage of the Wood Release Clones' suicidal assault, Sasuke made his move.
His right eye focused, connecting to Blue Moon Island and opening Yomotsu Hirasaka!
Everyone hurried over, but no one rushed to enter first.
Kabuto's headless corpse lay slung over Jugo's shoulder.
A white snake dangled from Orochimaru's sleeve, Kagami Uchiha's Mangekyō Sharingan appearing in its eye sockets!
"Sasuke-kun, awakening Itachi's Rinnegan consumed quite a bit of my divine power, too. I can't offer much help in combat now, so let me replenish your eye power!"
—Amaterasu-Ōmikami!
"Zzz...!!" The Six Tomoe that had vanished from the Rinnegan's ripples... lit up again!
Amaterasu-Ōmikami could restore light to eyes blinded by using Izanagi, but that was not its only effect.
When used on eyes that had not gone blind, it replenished their depleted Eye Power.
"So Amaterasu-Ōmikami can do that, too. Thanks. That's a huge help!"
"Everyone, get moving."
Suigetsu said indignantly, "Hey, are we really going to be okay? I might not be that smart, but no matter how I look at it, that bastard Obito is already invincible!"
Sasuke said calmly, "No one in this world is absolutely invincible. Every jutsu has a weakness. Even if the jutsu doesn't, its user certainly does."
With