Frankly, Itachi takes this match on his own; though I wouldn't even call it a match at all.
With given intent, Sasori is not surviving the first minute. Itachi will simply close the distance [
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] [
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]; once Hiruko is within his range, Susano'o crushes it [
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] right along with Sasori. Alternatively, Susano'o's final version is summoned right away; Totsuka no Tsurugi then spears Hiruko from afar. Though the Chakra's manifestation might put Sasori on his guard, Totsuka's size and the speed at which it is wielded won't allow him to evacuate Hiruko in time. Orochimaru is not preventing any of those assaults, either. He will be perplexed by Itachi's swiftness just like Bee was, unable to respond in time. That is, however, not even considering Susano'o's instant activation; which happened faster than Minato was able to extend his hand [
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] and could not even be predicted by a perfect Sen'nin [
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].
What remains is Orochimaru who will then be at Itachi's mercy. As both hype and feats suggest an overwhelming gap between them, I don't see any need to deepen this part of the battle.