Mei's Mist barely obscures vision in the first place. It's somewhat effective in the beginning but we seemingly realise it's not even present several minutes into the battle
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. Even in the very beginning it doesn't obscure vision by too much
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, so a Susano arrow is in no way out of question. Plus, massive Katon easily evaporates all the water droplets in the fog, and vision would be completely clear for Sasuke's Susano Arrow to be fired. At that very moment they'd need a defence, one which they don't have.
Itachi summons 50 crows to flock the Gokage, 10 on each, they're going to close their eyes to prevent the Crow from going right into their eye sight? Yea, no. Not how it works, they won't know which one has the Sharingan and they won't be able to prevent the Genjutsu unless they close their eyes. Gaara and Tsunade would be completely prone to the Genjutsu, they are easy targets and once they're in the Genjutsu a follow up like Susano arrow or Amaterasu is easily ending them. Not sure what sand screens you're talking about, but Gaara has never used any sand screens fyi.
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Fodders with Kyuubi cloak doesn't change the strength of the Kyuubi cloak. Hashirama with a Kyuubi cloak still has the same durability so your attempt to undermine its durability is ridiculous.
Anyways, this is pretty much going right into the hands of the Uchiha. The Mist disappears once the Katon is used via evaporation and the Gokage thus have absolutely no LoS. On the other hand, the Uchiha can see the Gokage just fine with their Sharingan that sees right through the sand. Gaara has 0 reason to use an absurdly thick sand when all he's doing is blocking the Katon with the heat resistant properties of his sand, no reason for him to waste chakra on extra sand. Sasuke sends out a large Susano arrow right through the sand and kills Gaara or Mei. Obito has the ability to warp behind any of them since he can see them via Sharingan, and they won't realise it. Gaara's shield is the reason they block the Katon (given it's enhanceable by Amaterasu in the case Mei whips out Suiton) but also the reason they lose. Counter this strategy.
This would require Tsunade to know a massive Katon is coming from beforehand, which obviously isn't the case . No Suiton enhanced by Tsunade will be happening unless the user is yelling out that they are about to use a massive Katon. Jinton as well, there's no way Onoki can react to a large Katon from 10 meters with a Jinton. Not a chance since he
can't even see the hand seals being formed.
Good thing that would never happen seeing how Itachi's Yata Mirror cannot be grabbed, Sasuke's Chidori Nagashi negates it, and Obito would be more then capable of helping out Madara with his Kamui's absurd speed.
Crow does it just fine. Plus, Madara was capable of forcing Genjutsu 1v5. Sure he's much stronger in Edo, doesn't change the fact that he didn't accomplish it using any EMS techs though. Plus, Itachi is better at Genjutsu. Then add in the fact there's 4 instead of 1 Genjutsu users and I see no reason as to how the Gokage avoid it.
