Observing this panel
This thread is just my opinion on this panel.
"Them" in the above panel, could be either of these two pairs
1) Hashirama and tobirama
2) Sage of six paths sons
Possibilites of pair one:
For it to be pair one, then that would mean the scroll contains a certain jutsu..i like to call it the "Reverse Dead Demon Seal Technique" that allows the user to control the revived person, but it would require a body to put the soul in. It would be an easier form of what madara did by releasing himself from Edo tensei.
It would also show that Orochimaru was working on a way of freeing Edo's from the Shimigami..as it was the biggest flaw to his edo tensei at the time...maybe he wanted to get the hokage's souls out for evil his intentions.
and this would also be a great explanation as to why Taka could rule the world, but there's a negative to this pair. Sasuke says:
"I dont know much, i want to know everything about the clan and the village"
I doubt there's much Hashi & Tobi would be able to tell him about his clan...and he already knows a great great deal of things from itachi n tobi about the bolded above.
He wouldn't be asking for information he already know...like the Uchiha clan massacre for example. so theres a 40% Chance it's the 1st n 2nd hokage.
Possibility of Pair 2:
Well he said he wants to know EVERYTHING!, the clan derived from the younger son of the So6p, and the village would be more directed to Senju..more so, the Older son of the So6p. This pair would make much more sense...it could also give a more detailed background on the "Swirly eye" maybe even the fight between the two bro's...and some more background history on the So6p and Juubi.
There is a notion going around that people seem to believe the time between the day's of the So6p and presently, is 100,000 years or something. but i doubt. As a matter of fact...the younger son could even be Madara's Grandfather. There is more of a possibility for this pair. i'd give it the remaining 60%
Kishi will troll us with new characters. - i doubt.
what do you think?