Great response and it's nice to see Manda II taken seriously but I think you're overlooking the straightup stamina issues and the fact that this battle is gonna go on for DAYS any way you see it. You're underestimating the army who have countless alternative ways of attack, all at once. Hanzo's huge valley of poison, Deidara the endless Suicide bomber, the chance of Naruto getting ATOMISED, Nagato's chibaku tensei, shinra tensei, unkillable summons or explosives, silent killing and Hidden Mist, 6 Jinchuuriki etc.
1V1, Naruto would have next to no problem with a lot of these. But all as once? When they're not even the main show. I can see him falling prey to the poison.
Idk about them. BM Naruto was handling the Jinchuurikis with ease, it is seemingly agreed upon that BSM Naruto's isn't that much of a boost but it would still be enough to stomp them again. Hanzo's poison could work but only in mist, he can't scratch a BSM avatar or catch up to these versions of Naruto here, he'll likely get blown apart multiple times over and over in the crossfire.
Deidara's suicide explosion will probably just blow away everyone else, BM Naruto's avatar was able to tank the Juubi's laser beam, I'm not saying that Naruto will stand there and take it but he certainly won't be put down by it, or at least, it won't be too much trouble. Atomisation is a good bet though, albeit one that he'd need to set up, and with the crossfire, he probably won't.
BM and the subsequent versions have more than enough firepower to blow the core off before it can do anything. Nagato is a good, dangerous bet though, although I don't think that his giant creature can really damage the avatar. True though, I forgot and under-estimated him.
Unless it's a powered-up or giant version, Shinra Tensei won't really help against an avatar. He's better off using Preta to take a BD for the army, even if a BSM's BD could probably do him in, heh, who know ?
Silent Killing and Hidden Mists are worthless, Naruto has two way to see them coming and Zabuza can't scratch BM.
True though. I think that the scenario is pretty unfair because Naruto lacks sealing and, as we know, killing the user won't defeat ET, unless Kabuto's death is enough for Naruto to win this. I don't see it lasting long, though. Naruto can also fight for a very long period with his chakra, and should realize that it's pointless to fight the Edos. At this point, he can either search for Kabuto (which is risky with Madara and Manda II in his path, especially because of the former) or eventually succumb to PS.
RSM Naruto definitely win, simply because he can kill Manda II now, can fight and destroy Madara's PS and permanently kill him with the Gudoudama and then proceeds to just blow the entire army away (no need to seal them all), at which point, he could try to see where Kabuto is with sensing and probably nuke the spot.
Again, idk. I think that BM and BSM will eventually fail, but RSM has the tools to win this battle. He's tier above the strongest Edo (Madara) and can permanently end him.
^^BSM Naruto.
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Naruto in the process of a pimpslap, notice the eyes.
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BSM Naruto would've fell to Madara's limbo anyway, but I just wanted to point it out.