I'm not really 100% sure of this list but its what came on my mind.
I'm not saying summons are unfair, I'm saying your pitting Itachi against 5 people and saying he would lose. Your not relying on Orochimaru's power, I'm relying souly on Itachi's. In a 1 on 1 Orochimaru loses to Itachi. If Orochimaru was to summon all the four dead kage, than yes, he could win, but only because those kage are stronger than Orochimaru. Also didn't the manga just establish that Orochimaru couldn't fully control Hashirama?
Even if Oro uses Edos it's considered as a 1 vs 1 since it's the users power.
Well an amaterasu would be fast enough to catch him in time before that.. if he uses his body shedding technique he's going to use up a lot of chakra.. Btw if oro does use edo tensei can't itachi undo it since he knows the hand seals now? or what if he catches him in genjutsu and makes him undo it.
He would have to look at his eyes for Tsukuyomi to work, unlike the first time they fought, he has intel on Itachi and knows he must not look at him in the eyes, Oro only need to do one hand seal to wins, just accept that Itachi has no chance of winning.
most of his fights he was restricted from performing hand seals, what are you talking about??
No it wouldnt work, dont you think he would have just undid the jutsus without having to face Kabuto if that was the case?
