What if the one who knew the most was Danzo? Or Danzo and Sasuke's parents? What if either Danzo didnt die or all will be revived with ET? We have seen stranger things... Another thing, I find it strange that the uchiha's are one of the strongest clans ever yet besides Itachi and Madara no other Uchiha was revived... Not even Izuna...
Thats true, even if we did not know the people
themselves, all they would have to say is "We
are the Senju" for the gasp effect... They
pulled out people we have heard less of and not as
powerful and the two clans.