This recent chapter we see that Kabuto has a big smile on his face when he sees Sasuke behind Itachi. Now I would assume that Kabuto doesn't know the truth behind these two. I think that Kabuto still thinks that Sasuke is still out to seek revenge against Itachi. So when Kabuto seen him in the back ground he thinks that the saga would continue here thus his life being spared. Kabuto only THINKS Sasuke defeated Itachi which that isn't the real truth. Kabuto must think that as of now Sasuke is stronger then Itachi. We need to remember that Kabuto also doesn't know that Sasuke has the EMS as well. He probably also doesn't know that Orochimaru was sealed by Itachi and is no longer apart of Sasuke.
This will be very interesting indeed to see what happens. If Kabuto knew that Orochimaru was actually sealed by Itachi then he obviously would have tried to release him since he would have total control over Itachi before the fight with Nagato.
This will be very interesting indeed to see what happens. If Kabuto knew that Orochimaru was actually sealed by Itachi then he obviously would have tried to release him since he would have total control over Itachi before the fight with Nagato.