Oro doesn't have control over the Hokages.

[Aya San]

All Orochimaru did was using Edo to revive the Hokages, I believe he doesn't have any control over them because he didn't put any seals into their neck. Next thing we know Hashirama and Tobirama will release Edo Tensei and go help Naruto . I don't know if Minato know the jutsu but i guess he can learn it? Hiruzen should be able to release it too since it is said that he knows every single jutsu exist in the leaf (Edo is originated from the leaf).

Spoiler

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Main objective to achieve this: Stop Oro from cancelling the jutsu first.

 

[Punk Hazard]

Who said Oro has awakened them yet?

 

[Snape Uchiha]

Obviously Orochimaru will put Seailing tags in them. He only didn't because the chapter ended the second he reanimated them.

 

[ARandomBlackKid]

Obviously Orochimaru will put Seailing tags in them. He only didn't because the chapter ended the second he reanimated them.

Thiss

 

[-Raviel-]

why would he bring back 4 people who can trample all over him without having full control over their actions?

 

[Kyuubibomb]

Obviously Orochimaru will put Seailing tags in them. He only didn't because the chapter ended the second he reanimated them.

this

 

[Yashiro]

Obviously Orochimaru will put Seailing tags in them. He only didn't because the chapter ended the second he reanimated them.

What he said^

 

[JDuzumaki92]

He will use talismans to control their actions but,like Kabuto, he will leave their personality alone so they can answer Sasuke's questions.

 

[Dr Strangelove]

Obviously Orochimaru will put Seailing tags in them. He only didn't because the chapter ended the second he reanimated them.

^^^
Most likely.

 

[LolaxXx]

why would he bring back 4 people who can trample all over him without having full control over their actions?

^this.
/thread