Here is what I think
[video=youtube;iLuJAtDgHnY]https://www.youtube.com/watch?v=iLuJAtDgHnY[/video]
Well if you read the manga then you know Edo Itachi kept up with KM Naruto who was at 1/13th the power since he made 12 clones before meeting up with Nagato and Itachi while he faced A before making any clones
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. Naruto wasn't even at full power when he was facing A, he used a ton of chakra in his training and had no rest then he entered the war so even that wasn't full Naruto
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(used up ton of chakra) and
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(Naruto not taking a break when Bee advice him to and he's injured).
Hashirama never said Itachi was stronger than him, only a better Shinobi since Itachi was willing to toss away his clan for the better of the Village and even joined Akatsuki to be view a villain to spy on them. That doesn't mean he's stronger, Kakashi actually said Naruto surpassed the Hokage which is actually saying he surpass them
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.
I see you didn't mention how Itachi was dying from his disease and even felt his death approaching so used medicine to prolong his life
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. That A who has knowledge on Itachi enough to know what the MS is (
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) and enough for even one of A's body guard to know Itachi's Amaterasu enough to compare it to Sasuke (
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), Stated he thought no one would surpass Minato
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. Itachi also have low stamina while Minato have a large stamina since SM training requires having a large stamina. Don't count genjutsus happening since Itachi will be too busy trying to keep track of Minato.
Itachi is slower than A is, A lightning armor lvl 1 counters the 3 tomoes Sharingans
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and Lightning armor lvl 2 counters MS which Sasuke couldn't even react too
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. Minato base speed and reaction speed is faster than Itachi's and even more so when he uses FTG. If MS Sasuke couldn't even react to A's speed when he was keeping up with Itachi's fairly well then how do you expect Itachi to react to someone faster than A? Sasuke was stated to have better eye power than Itachi since part 1, he just needed training to master his eyes
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.
Jiraiya who knows of Itachi, Kakashi, Kabuto, and Sasuke, said he haven't seen a genius like Minato since Minato himself which Tsunade didn't deny
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.