Why didn't Kabuto ever use the Edo Tensei on Orochimaru?

[pateuvasiliu]

Oro was sealed.

Think of it as how Oro was unable to summon the 4th Hokage.

 

[SAGERIKUODOSENNIN]

Oro had his hands sealed and he was sealed by itachi. But ur kinda right, kabuto didn't bring him back from anko's curse mark when he had the chance this whole time

 

[HiddenSound]

It would be an insult to his master.

That, and the last time he saw Orochimaru was after his battle with Sasuke. He may have thought he was still in Sasuke, therefore unEdoable