"What Is Filled" (埋めたもの, Umeta Mono, Viz: That Which Fills the Hole) is chapter 651 of the original Naruto manga.
As Sasuke's Susanoo equips itself onto Naruto's senjutsu-enhanced Tailed Beast Mode mantle, combining the two young men's abilities, much to their surprise, Kakashi — who is still in Kamui's dimension — is able to both see and hear what is going on via the link shared between his and Obito's Sharingan. Readying himself for one last all-out counter-attack, Obito manifests a gigantic shield and the Sage of the Six Paths' legendary holy weapon, the latter of which he commented was used to shape the first world, would now destroy the one he considered to be fake. Creating nine Rasengan in Kurama's tails, Naruto contacts his comrades from the Konoha 11 and Sai to join the fray. As they jump directly into Kurama's tails, they themselves don Tailed Beast Mode mantles much to their shock. Naruto charges them to break down Obito's defences using the Rasengan, so that he and Sasuke could have a direct shot at attacking him. As their attack is launched, a confused Obito begins to see more of himself in Naruto and even begins to hallucinate about what his life could have been like — even without Rin— if he had returned to the village instead. Ultimately, the shinobi are able to break through his defence, and the two young men are also able to deal a devastating blow to Obito with Susanoo's sword.