You basically shot yourself in the foot, as Itachi basically synced his eye with Shisui's eye. And Cool story. You mean this actually happened:
Itachi's eye reacts to Naruto and calls out the crow -
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The same eye starts oozing blood here -
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He completes the syncing here to detach himself from Kabuto's hold -
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- The syncing is 'Clearly' shown between his eye and Shisui's that basically reflected KA at his MS.
After it is done, he his eye-strain appears here -
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to use Amaterasu and does so on the summon -
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- when Nagato is completely oblivious.
Nagato is such a great sensor that he didn't sense any pressure or anything and received it here
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and never saw it coming or didn't even sense it. The original argument would only hold had he sensed the pressure built up during the additional uses that followed the 'supposed' sensing.
So why don't you point that self-righteous arrow at yourself and try and grasp the manga or 'delete your account and get out'. We need less of your kind. Even a vegetable could have easily understood these images. I suppose it's asking too much on this base. It's akin to a freaking miracle.