I'm guessing we'll see some Edo bodies turning against Kabuto.. we've already seen them warn their past friends to run away, or say that they don't want to fight for someone like Kabuto. He's also stated it's difficult to control so many; he seems to have a lot of faith in his ability to turn them into "mindless killing machines"... somehow, I have my doubts.
He HAS taken the ability to a far higher level than Oro, at least in terms of how many he revived, how many he's controlling at once, and maintaining their original personalities/skills.
IMO the only Edo shinobi capable of possibly breaking the Edo control are Itachi or Nagato because both posses special dojutsu. In Itachi's case it may be possible that his Edo Sharingan can reverse control of the technique. In Nagoto's case his Rinnegan is suppose have powers that exist outside the living world so he may have way of gaining permanent control over his Edo.
To those that doubt this the fact that an Edo summon will continue to fight even if the Summoner himself dies is a clue they have some measure of independence once summoned and that the control part may be able to be broken provided they have the will and the power.
What chakra type are you?
That doesn't sound like independence to me. That sounds more like a car with a brick stuck on the gas pedal. The summons aren't choosing to keep on fighting. They keep on fighting because that would be the last order given to them before the summoner dies because they obey the will of the summoner.
Pandaman FOR PRESDIENT