Hirudora, who do you believe knows more about the power of the So6P. Orochimaru/ Kabuto or Madara?
Eluding my question, I see... but that's ok I guess.
TBH, I think there is not conclusive proof that could ensure that one of these parts could know more about the power of the Sage.
I could easily say that Madara was the one who had full access to the Uchiha Tablet and its contents with his eyes, and also I could say that Orochimaru/Kabuto had access to the powers and requirements to awake the Rinnegan by experimentation.
But please, be honest... can we say that Madara had access to the information referring to the original Sage's body (the counter-part to the Rinnegan)? Can we say that Orochimaru/Kabuto had access to that information as well?
We don't know. I only know that Orochimaru/Kabuto were the ones doing experiments out there (even with Hashirama Senju cells, Madara Uchiha cells, and the Rinnegan), while Madara was just a warrior with theoretical data about the Rinnegan (The eyes and raw Hashirama cells, with no laboratories to do better investigation).
Above all, this is pure speculation. I can't tell you things by certainity.
But there is a thing for sure that I could tell you... The Sage's body is not in the Senju DNA only. It is in the Uchiha's DNA as well, just as the Rinnegan shares DNA from both clans.