Reason why Sasuke revived Orochimaru because he knows Oro uses Edo Tensei.
The one who knows everything has died.
He and Orochimaru came to Uchiha village in Konohagakure.Actually,they came to Uchiha graves where many bodies of Uchiha rest.
The number 1 candidate is this guy:
What do you think?
Will it be this guy?