Sasuke wants answers to questions like
what is a clan?
what is a village?
So candidates that could go under this name and know about stuff like this that i can come up with would be these:
Sage of the 6 paths
edit. or Obito. That guy is like the storyteller. but he probably got it from Madara or the tablet.
I dont think its his dad since he would say its his dad. I don think its the Sage since that seems like overkill and not possible.
It seemed like but cant be Orochimaru because Suigetsu said, why would you want to see Orochiamru and who is the man that knows everything? So it dousnt seem that its him after that so that leads to Madara Uchiha.
Madara should know stuff about village and clan since he led his clan anc cofounded Konoha.
So he might want to try and team up with Madara.
Also Madara seems to have contributed with alot of info.
Then its the scroll.
Suigetsu said that they could probably figure out how to use it and didnt need Oro, He also said to think that Oro even consideered something like this.
So it seems it could be Edo Tensei. Edo Tensei is something that they might figure out how to use but that Oro could help with.
So it seems then like a powerful summon connected to a place Sasuke knows well.
The candidates for that seems to be either Sage of the 6 paths/his family or the Uchiha clan. Obito had eyes from them in his hideout, and all that is technicly needed to revive them would be those eyes and then bodies.
So then the most reasonable thing to consider so far is that Orochimaru considered reviving maybe the strogest or all of the Uchiha peeps, he had alot of test subjects so bodies wouldnt be an issue, And if thats what they are gonna do then they would go to perhaps Oros hideout or an Uchiha hideout which Sasuke would know well. It seems to fit but it still dont seem that reasonable perhaps.