The Progenitor

Summary
While analysing the situation before them, the shinobi are told by Tobi to witness as the Ten-Tails was revived and with it, the beginning, and end of the world. Confused that Tobi would be able to do this, Kakashi notes that the war was all for the sake of preventing Akatsuki from attaining the Eight and Nine-Tails and since they still had the beasts, wonders whether Tobi was lying. Remembering what Tobi had said and then the fact that they had used a clone made from its chakra, Gyūki reminds B of this who then notifies his comrades. Speaking to Naruto directly, Kurama notes that its chakra was also present in the Benihisago and Kohaku no Jōhei which the Demonic Statue of the Outer Path had consumed and asks Naruto to switch with it so it could explain to the others. As the fox explains the story behind the two Treasured Tools of the Sage of the Six Paths, the Gold and Silver Brothers and how they had come to attain it's chakra after which Kakashi corroborates his story with the intel received from headquarters. With this, Kakashi declares that he would like them to do something before the beast is revived leading Tobi to retort that because Kakashi always spoke so easily, it had led him to live a life full of regret shocking both Kakashi and leading Guy to question Tobi once again, on who he was. Rebuffing this, Tobi told Guy it would make no sense to tell him because he didn't remember faces. Interjecting, Kurama tells them that as Kakashi said, now was the only time to do something about the situation as the Sage of the Six Paths had told them that the revival of the Ten-Tails signalled the end of the world. Answering Naruto's questioning of the Ten-Tail's power, Kurama tells him of the beast's might and the fact that amongst all the names it was known by it was also seen as the progenitor of all that existed in the world. The beast then goes on to state that though even it alone would stand no chance against the beast, it may be possible since Tobi did not possess all of the Eight-Tails and it's own chakra. Tobi however rebuffs this stating that he only needed the beast to cast the Infinite Tsukuyomi on the world. Switching back with Kurama, Naruto declares his dreams to Tobi with Guy, Kakashi and even B (who reveals his sexual fetish to those present; much to the Eight Tails' shock) rally behind him. As Tobi launches into another speech, Naruto enters his Nine-Tails Chakra Mode and attempts to land a high-speed Rasengan attack on the statue but Tobi blocks it with his Gunbai prompting Naruto to state that it seems as though he would really have to bash Tobi's mask it. Tobi responds noting that there was one thing he could not part with and then declares that he would not let them touch the statue.

Trivia
A "progenitor" is a person or thing from which a person, animal, or plant is descended or originates. Simply put: an ancestor or parent.