Here is what I see happening.

Oro has Sauske's body.
Naruto and Sausoro face off.
Naruto get his ass handed to him.
Just as Sausoro is about to kill Naruto, Sauske's takes back his body or some other shit along that line.
Oro dies.
Naruto and Sauske team up and whip Itachi's ass.
????
Profit.