okey....how did oro made 1st and 2nd his slaves...?
The answer could be as simple as killing the summoner, and the Zombies Could just stop fighting. because the summoner is gone. No more summoner, no more bidding. I say it all depends on how the Jutsu works and we don't know the answer yet, one way or the other.
But then Sandaime wouldn't have to seal all three of his opponents, but just Orochimaru and after his defeat the 1st and 2nd would have stopped their attack.
I don't think the 3rd would have sealed their souls if it wans't neccessary, knowing the fate of those who are sealed by the shinigami.
Besides I think he could have sealed Orochimaru's entire body and not just the hands if he didn't have to seal the two former Hokages first.
Most likely the summons don't regain their free will after their summoners death.
He didn't have enough time and strength left yo kill Oro with the Dead demon seal, so he used what he had left on Orochimaru's hands.
Yea I know that, but I just believe he could have sealed the entire body like he intendet to do if he didn't have to seal the first and second Hokage before.
I assume that he lost a lot of energie and simply didn't have enough streangh left to do it a third time, especially since Orochimaru was so stubborn and resisted so much.
It's just an assumption of mine though, he might not have been able to seal him even without sealing the other two Kages first.
Still I don't think he would have done it if it wasn't absolutely neccessary because as far as I remember the fate of the sealed one is quite bad.
(What was it exactly again, the soul never finding rest and piece, fighting with the opponent's soul for all eternity or smoething like that. I'm sorry I don't remember exactly but it doesn't sound that good.)
I guess he would try to spare his old friends if it was somehow possible, wouldn't he?