Board Thread:Naruto Discussions/@comment-25409224-20140913064011/@comment-1018594-20140917160208

I have a feeling Kishi is gonna pull some Star Wars/Harry Potter type bullshit and have Hagoromo send the souls of Nagato, Itachi and/or Jiraiya to help him against Sasuke.

If he can have every single Kage ever come back for a few seconds to do a Summoning Jutsu, I wouldn't doubt it.