If there is water nearby Zabuza's suitons slam tsunade off the slug .. or just finish the slug itself, and its said his wind blades were able to cut through even Iron ... so Gaara's sand being penetrated by them is not improbable,And your saying tsunade could buy time for gaara? tsunade would be stomped by all these shinobi too quick as i said earlier Neji can solo tsunade IMO... So if they did follow that strategy the would surly lose
Iron, lol, Gaara's sand was stronger than 5mm of steel all the way back during the chunin exams. Temari can easily cut through metal armour yet can't do anything to Gaara.
Neji can only solo Tsunade if Katsuyu is restricted but this is a team battle. So Tsunade gets stomped by all these shinobi yet she managed to hold her own against 5 susanoo clones. You don't make much sense really. Tsunade can't solo these guys but her alone can push them to mid difficulty allowing Gaara to create a desert which will bury these guys.
Zabuza's suiton are inferior to Mei's so I doubt they will faze Gaara's sand which he can raise to protect Katsuyu. Also Tsunade can reverse summon her slug so it won't get hit by the water. Alternatively, Katsuyu can counter suiton with acid.
Tsunade can take out quite a few by herself, Hidan, Asuma and maybe Zabuza or Kakashi all together. She can't beat all four of them, just three. She was fast enough to make it Madara in a very small amount of time while she was 50 m away from him.
She initially started way back
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Then managed to cover the distance fairly
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Madara only had time to use ribcage susanoo hence he pretty much got blitzed as he didn't manage to manifest a stronger version of susanoo in time.