Itachi's main strengths are Ms techniques and genjutsu. I believe deva path would be able to counter all of them and overpower Itachi.
Amaterasu could be countered by
Susanoo.
Tsukuyomi. I'm going to have to give credit to
There's also Chibaki and the large shinra tensei which could both easily destroy a village.
Amaterasu could be countered by
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with the right timing, since it's a slow burning jutsu so he can blow it away before it does some serious damage. Itachi isn't like Sasuke and doesn't have blaze release so he can't continue to throw amaterasu which would also cause a strain to his eyes. He won’t be able to exploit deva path to exploit the 5 second interval, not that he's knows there's one.Susanoo.
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So with
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he could rip Itachi out of susanoo and stab him with the black rods
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. I also feel he may be able to destroy susanoo with
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which led to 3 boss toads getting
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I know Madara's susanoo is just in its skeleton form and has been smashed a few times, but it's still debatable if a full susanoo can be broken. I also don't think Itachi's totsuka sword would work either.
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and
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.Tsukuyomi. I'm going to have to give credit to
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. In short it mentions chakra receivers could stop genjtsu as Nagato is constantly running chakra through the paths bodies. This is what Chiyo talks about in the spoiler and the chakra receivers would do the job. He also argued that Nagato let the paths get caught in genjutsu to catch Jiriya off gaurd and it's still up for debate whether genjutsu would be effective or not with superior eyes because
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so two levels above should logically offer more resistance.The ninja needs to stop the flow of chakra in their body, and then apply an even stronger power to disrupt the flow of the caster's chakra; this is called Genjutsu Dissipation (幻術解, Genjutsu Kai). This can also be done by an unaffected ninja by applying a sudden surge of chakra into the affected person.