Scenario 1: Orochimaru wins mid diff at most
--BM Minato powering up Hashirama, equals all of kabutos edos getting raped left and right, where TBB barrages nuke everyone in the battlefield and clear the entire battlefield within seconds,
--with the battlefield clearing up, cloaked Hashirama pounds PS with SS, therefore getting rid of madara who is the only one standing even a remote chance against their firepower,
--Jins are utmost non factor, when they dont have their bijuus within them, and even if they do, myojinmon pins them down, and allows the hokages to seal them down
--once madara and nagato are down, Flower Tree World can also put all the other edos down to sleep, or Minato just fires more of his TBB and vaporises the fodders to paste
Scenario 2: Orochimaru still wins this,
--With madara down, no one stands a chance against minatos firepower, nor do they have evenn a remote chance on scratching his avatar, so Minato fires off multiple TBB and vaporises them to paste
--Nagato is the only one standing even a slightest chance however he gets tagged with ease, as once that happens hes done for,