Oro scroll.

[Steinbiz]

Well ever since the fight against Hiruzen, Orochimaru has been unable to form seals for jutsu. So maybe that scroll really does have something to do with reversing the effects of the Death god and gaining access to his arms again to perform jutsu. this would also mean that Hashirama, Tobirama, Hiruzen and Minato could be edo'd back. And the other half of Kurama's chakra as well. Although that's a lot of power, I still don't think that could control the direction of this war. The Jyuubi is just too powerful for even that to make a differance.