sasori have no chance, mosst akatsuki don't have, kakuzu, hidan, konan, zetsu, deidara. the only people from akatsuki can are kisame obs, itachi by sealing it, and pein, obito.
It stands for Kyubbi Naruto four tails. In other words, four tailed Naruto that fought Orochimaru.
Any Naruto wins high difficulty. He can roar away the poison and also destroy many puppets in the process. Iron sand isn't piercing Naruto's cloak if the Kusanagi blade couldn't.
I can honestly see Sasori pulling this extreme diff with a certain premise:
Although Sasori cannot penetrate the cloak with Iron Sand he could still use it as an advantage for this (remeber you are not suppose to block the attack like Sasori says:
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As you can see Sasori explains that using the Iron Sand helps magnetizes the opponent when they are hit by it. Much like this:
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With that being said once KN4 gets magnetize Sasori's strategy would be consuming the beast with Iron Sand to subjugate him (Example):
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Then:
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(INSTEAD OF ROPE BINDING SAKURA AS AN EXAMPLE PICTURE IRON SAND)
(INSTEAD OF ROPE BINDING SAKURA AS AN EXAMPLE PICTURE IRON SAND)
Finish it with a subjugated KN4, by forcing it to inhale the poison.