Madara and hashirama weren't stupid, they may not have a clue at first about what they were watching but now they started to have an idea, and that idea was further solidified when one of that female sons awakened the Sharingan.

Then they watched an earth-shaking battle between the female in the form of a ten tailed beast and her two sons that stretched over a very long period of time before ending with the brothers winning, but even with all that they weren't able to kill their mother she was just so powerful, so they ended up sealing her, and that's when duo witnessed the creation of the moon.

What the two brothers didn't notice but Madara and hashirama did was that before she was sealed a black substance shot out of her body and burrowed deep into the ground before disappearing.

After the battle was finally over they watched as one of the brothers the one that now has the rinnegan separate the chakra of his mother into nine different parts which formed nine tailed beasts.

Not long after that, they watched as the second brother the one in possession of the byakugan bade Farwell to his brother and went to the moon to stand guard over it leaving only his brother behind.

At this point, the vision ended and they found themselves back where they were before, and they could tell that not even a second has passed here in the outside world.

Rei sat there watching them as they had dazed expressions on their faces.

The first to recover was Madara, he looked at rei and asked, "what was that" his question brought hashirama back from his daze.

"I think you already know but I'll tell you anyway, that was the history of the shinobi world, part of it anyway, that female you saw was the mother of all chakra, Kaguya, and her two sons, one of which am sure your pretty Familiar with" he paused before continuing, "the sage of the six paths, and as for the reason I know all this and was able to show you it is one of my eye's abilities it allows me to see into the past and the future," said rei.

"Why are you showing us this rei??" hashirama asked, although he and Madara have already come to a conclusion they needed to be sure.

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"I am sure you guys noticed that black substance that came out of Kaguya," said rei, before continuing "that was also her son, or more precisely a manifestation of her will, it is called black Zetsu, the scenes that we saw was from one thousand years ago, and from that time black Zetsu has been scheming and looking for ways to free Kaguya from her seal"

"and how exactly does it plan to do that" asked hashirama with a rare serious expression on his face.

"Madara when you awakened your Rinnegan didn't you fell a strange sensation coming from the moon? like there is something there you could summon" instead of answering hashirama rei turned to Madara and asked a question of his own.

Hearing rei Madara was shocked for a second before saying "I did, and I even considered proceeding with the summoning but than I thought about it and figure that am already strong as I am now, and relying on external power will only hold me back" answered Madara.

Rei raised an eyebrow hearing Madara answer as this proves that he had changed from what he remembered, in the anime, he never did hesitate to rely on the nine tails and the judo statue in his fights.

"what you felt is the judo statue, the container of the tailed beasts, by sealing all of the tailed beasts inside it the ten tails that you saw in the vision is born, and by becoming the ten tails host you will have to cast a genjutsu on the moon which will, in turn, put the whole world in a genjutsu slowly turning them into what you saw in the vision, the white Zetsu's, but that's just a side effect of the genjutsu the real purpose of it is to undo the seal that is holding Kaguya, and that is how the black Zetsu plans to unseal his mother hashirama, "Rei said in one breath leaving both Madara and hashirama gasping, especially Madara.

Giving them a moment to process all that information rei continued," but to do all that the black Zetsu first need someone to awake the rinnegan because without it, it can't proceed with any of its plans, and the best candidate for that is obviously you" as rei finished both he and hashirama looked at Madara who was strangely silent.

"but to awaken the rinnegan you need both the Senju and Uchiha bloodlines which you obviously don't as you are a special case and are able to a awaken even Rinne Sharingan, but the black Zetsu doesn't know that, plus you hiding you true abilities made it even harder for him to find out," said rei.

both Madara and hashirama have only been showing powers that is only a bit stronger than their anime counterparts,

Even then they are still considered monsters but they are a far cry from their true selves.

"so tell me if you are the black Zetsu and you need Madara to awaken the rinnegan what would be your best course of action," asked rei.

"I would sabotage the relationship between the Uchiha and the Senju, make them hate each other one way or another, but most importantly I would make sure the relationship between me and Madara is irreparable while divulging the information about how to awaken the rinnegan, that way I'll at least be sure that Madara will try to get his hands on the Senju bloodline or my bloodline as it's the most powerful, "said hashirama in one breath.

Rei and Madara just stared at him with wide-open eyes, that was just a rhetorical question and he didn't really wait for an answer as he was gonna answer it himself, who would have thought that hashirama would be such a good schemer.

"holy shit man, when did you become so... Scheming? " said rei shocked.

"Hahaha..." hashirama laughed awkwardly while scratching the back of his head.

"wow, anyway that would be the optimal way to go about it," said rei.

"that mother******," said Madara his Rinne Sharingan activated and his killing intent erupting so intensity that it would make even the most hardened shinobi shake in their boots.

" Hey, what's gotten into you all of a sudden "asked hashirama clearly confused.