In the most recent chapter, we saw that Suigetsu was with Orochimaru when he went to the Kages. We know that Suigetsu doesn't really like Oro so I had an idea. What if Oro brought Suigetsu along so that he can retrieve Jiraiya's body? Since Suigetsu can merge with water, he would easily be able to go and retrieve it. Then Oro would use Edo Tensei to revive him, and we would have the old Sannin along with the new Sannin at the battlefield. I don't know if this was posted yet or not, but a short search proved no.