I know who the one who knows it all is
This will happen sometime past chapter 615
Orochimaru: I still can't believe you've had a change of heart Sauske
Sauske: Just keep moving
Sugietsu: I don't like it
Jugo: Sauske knows what he's in for
Orochimaru: STOP, were at the Konoha limit. If we pass this point we will get detected, Sauske, take us in and show us the way
Sauske: (Stern look)
Sauske ends up leading them to the underground Uchiha stone tablet.
Sauske: Orochimaru, you knew what this said all along?
Orochimaru: yes Sauske, the reaper death seal is the only way to talk to them. I did more research on the seal after the 3rd used it on my arms.
Sauske: yea I know
Sugietsu: what's going on??
Sauske: the reaper death seal is a forbidden jutsu that takes a life of another in exchange for your own life.
Jugo: but what?
Sauske: you can talk actually summon the dead to talk to them.
Suguetsu: this is very convient Sauske
Sauske: it comes at an extremely high price, the one you choose to speak with has the option of taking your LIFE to replace THEIRS!
JUGO and SUGIETSU are shocked.
Sugietsu: please don't do it Sauske
Sauske: I have to
Sauske forms the seals and activates the death seal.
Jugo: I don't see anything
Orochimaru: Sauske is in a different world now
Sauske: I wish to speak to the previous Hokages
Death Seal: this may cost you a heavy price
Sauske: I respect your power and I ask that you honor my request
Death Seal: Very We'll
The previous Hokages show their faces and are 5 ft in front of Sauske
This is my prediction. Granted I'm open to suggestions on who the one who knows it all is.