Edo madara is being vastly underrated in here. If edo madara is excluded from the army(because he's already fighting them), The only challenge for Edo madara is Edo itachi simply due to yata and totsuka. Not even nagato is a challenge as his rinnegan mastery is vastly inferior. Everyone else gets baby shaked like the gokage. The strongest edo is edo nagato/edo itachi, after that it's one of the kages, and those guys are weaker than the gokage. It's a humiliating defeat against a guy who killed 99% of SA with 2 meteors or who can summon a gedo masu capable of restraining 9 bijuu in 9 seconds.
Edo madara would win this battle high diff. Current madara would neg diff as not one edo has any ability or the required speed to block omnyoudon - which breaks through their defence and kills their edo body instantly. Even Yata would most likely fall to that.