My only hope is with Orochimaru. He has to be planning to use the other three Hokages. No one is buying that he changed. His problem is to distract Hashirama. That can happen on the battlefield. Then he can use the other Kages against the Alliance so he is the last one standing at the end.
Otherwise they serve no other purpose since the odds are overwhelmingly on the Alliance's side. Obito will probably be dead by the time they get there.
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