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The first thing I thought when I saw Kabuto summon 5 shinobi, and some powerful ones at that. In fact, these shinobi are individually more powerful than Nagato's 6 Realms of Pain--Nagato himself is among the summoned. Now before people begin to harp about how the bodies may not retain their original power because of things that happened to them while alive, are we forgetting this guy?
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In that case, it apparently doesn't matter what happened to the physical body. Edo Tensei seemingly has everyone at full power; Itachi will have his eyes and such. Moving on, what Kabuto has done now soldifies him as the next metaphorical Nagato [And Orochimaru as one hell of a genius], as he's using numerous puppets in battle, and these guys are powerful. I do however, believe they're more powerful than Nagato, and Kabuto has surpassed him. [Most] of what the 6 Realms of Pain did, Kabuto can recreate with Nagato himself. Not only that, these are real shinobi with diverse, developed skills, as opposed to one-trick ponies most of the 6 Realms are. Before anyone harps about healing, Edo Tensei itself will heal any wounds.
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Defeating the jutsu requires the removal of the soul, which alone makes it more powerful than the 6 Realms. For intance, one Rasengan destroys Demon Realm:
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Frog Fu destroyed Hungry Ghost Realm:
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Rasenshuriken obliterated the Human Realm.
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Double rasengan destroyed Animal Realm:
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Same with Hell Realm:
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And Rasengan finishes God Realm:
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Such attacks [As mentioned above] will have no real effect on Edo Tensei, serving only to slow it down. Other than Nagato himself, Kabuto also has one of his biggest weaknesses: Genjutsu--Itachi is the genjutsu monster. I'm willing to say that if they were to fight, Kabuto would win. Wow what a chapter.