Countering Amaterasu won't be hard for someone like Sasori. While it's true that Sasori has no intel on it, he'll gain it as soon as Itachi tries to counter his Satetsu with it. Sasuke
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. After Sasori sees it once, he will know that Itach's eye bleeds before he uses Amaterasu. A simple counter to it would be
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. Go ahead and try to claim how that was Enton so it's slower than Itachi's Amaterasu, but not really. We have seen that in the manga,
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. That's why when Itachi tried to hit Sasuke with Amaterasu,
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and
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. In reality, alive Itachi's Amaterasu isn't any faster than Sasuke's Enton so Sasori can block it with Satetsu. Another simple counter to it, would be
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so the Satetsu Dome would take the hit of
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. And of course,
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for himself and the Sandaime Kazekage. Once Amaterasu hits him, he can just remove that layer of Satetsu Armor and make a new one. In a worst case scenario,
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. Don't even think of trying to say ''Sasori can't make Satetsu Domes or Armors'' because it has been stated that
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.
Sorry, but I'm using an alive sick Itachi (As stated in the OP) here and alive Itachi has never shown to use Amaterasu on the opponent first. He always uses it to counter the opponent's technique first instead. As shown in his fight with Sasuke,
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. And as seen in his battle against Jiraiya,
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. He also
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.
After Sasori sees Susano'o,
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. Afer he does this, Itachi's only way of reaching Sasori would be by using Yasaka Magatama or Totsuka Blade which can both be blocked by Satetsu. Don't even try on saying that Totsuka can't be blocked because it's a spiritual weapon. Totsuka
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and
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. Sasori can block it. Countering Susano'o isn't hard. All Sasori has to do
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and then
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. Once he does this, Itachi's Susano'o won't be able to move and
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. Oxygen enters Susano'o just fine so will poison. Once Itachi breathes it in, he will die. This isn't Sasori's only counter to it, but this is it from me for now.