Don't know of Kabuto's proficiency with Edo Tensei, though considering he was able to ressurect Madara BEYOND his prime, I'm certain he can restore people to their original states. In any case, this scan here implies that the more chakra one has, the faster and stronger they are. Itachi was so strong and powerful despite his low chakra levels because of his amazing chakra control which allowed him to use his chakra efficiently. Now take someone like him who was able to make such good use of his low stamina and give him endless chakra, and naturally this would mean his speed and strength would increase drastically. As such, I don't think its a fair assessment to say Edo Itachi's feats would be the same as alive Itachi's.
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Nope!
Madara was created pass his prime based on Kabuto's words
Orochimaru was the closest to bringing someone back full power.
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Also Itachi stamina was heavily underrated as he fought Sasuke on his death bed and lasted long enough to use Tsukyomi, Amaterasu spam, V3 Susanoo and lots of taijutsu and ninjutsu
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