a theory that fills basicaly every gap that matters exepts the 5 kages.
sasuke ressurected orocimaru, because he needed him to get to the one who knows everything, madara.
why madara? because when sasuke was thinking about them, it was either tobi or madara.
he needs orochimaru to edo tensei madara, teleporting him to them and stopping him from being uncontrollable.
therefore, madara will leave the battlefield, obito will be overwelmed( he is a match for naruto and kakashi together, and there are 30000 people there, and the juubi will have nothing to do.
this theory is almost certainly wrong. do not bother telling me it is.
countdown to sasukes rinnegan:59 chapters to go