Black Zetsu has never found the vehicle for recording history within the Senju Clan. After the death of Six Paths Sage Otsutsuki Hagoromo, it searched everywhere for traces of Otsutsuki Hagoromo's historical records but only found the Uchiha Clan's tablet, leading Black Zetsu to believe that such a vehicle couldn't possibly exist within the Senju Clan...
Now...
Black Zetsu suddenly realized it was wrong!
The ancestor of the Uchiha Clan, Indra, and the ancestor of the Senju Clan, Asura, clashed, and their Chakra has continued to reincarnate and clash. The Uchiha Clan has a tablet to record history, so why doesn't the Senju Clan have something to record their history?
Cannot!
The bark of the Senju Clan absolutely cannot be exposed, revealing the secrets of the Ninja World!
Black Zetsu lurked beneath the ground. A thousand years ago, it modified the historical records on the Uchiha Clan's tablet. The things recorded on that piece of bark must not be exposed!
No matter what... it absolutely cannot!
Especially letting Uchiha Madara know the information on it!
Once Uchiha Madara learns the history of the Ninja World, he will certainly doubt the records on the Uchiha Clan's tablet and will undoubtedly abandon the Moon Eye Plan!
According to Black Zetsu's speculation, the history recorded on the Senju Clan's bark and the history on the Uchiha Clan's tablet should be very similar, surely recording the revival of the Ten-tails and the history of Chakra Ancestor Otsutsuki Kaguya...
Absolutely cannot!
Black Zetsu's silhouette frantically moved underground. Its body was hidden beneath Tsunade's feet, ready to seize the bark early at any moment!
No, no, no...
There is other information that it missed.
Black Zetsu had been eavesdropping on the messages here, pondering why the bark fell into the hands of Akihara Kagura, and why Akihara Kagura would know the secrets on the bark...
"Senju Clan..."
Black Zetsu's body shivered with a chill, recalling the matter suddenly looping back to its logical origin: "That little brat Akihara Kagura... is part of the Senju Clan!"
"Senju Clan..."
Orochimaru, very shrewd, while battling Senju Tobirama, also recalled the origin of this matter: "Akihara Kagura... is part of the Senju Clan!"
"Only this way..."
"Can all the logic be accounted for!"
"Akihara Kagura is of the Senju Clan, even a direct lineage, hence able to successfully transplant the cells of the First Hokage, awakening the Wood Release!"
"Precisely because Akihara Kagura is part of the Senju Clan..."
"That little brat would know the secrets on that piece of bark!"
"Exactly..."
Senju Tobirama's wisdom was also exceptional; he quickly made sense of all this.
The Senju Clan's members lost countless lives during the Sengoku era, even the clan leader's children were perpetually threatened.
War not only signified sacrifice but also encompassed disappearance; perhaps a certain generation of the Senju Clan leader's descendants, after learning the secrets on the bark, outright stole it and disappeared together, leading to the Senju Clan thoroughly losing this historical legacy...
This piece of bark was extremely portable, unlike the stationary Uchiha Clan's tablet...
Senju Tobirama could even imagine what the historical figure who stole the bark looked like, surely someone like him, adept at research and strategizing, but with ill intentions, desiring to steal the family's secrets...
Akihara Kagura...
is indeed a descendant of that Senju clansman.