Even if neither Oro nor Sasuke showed up, they would have infiltrated a base sooner or later, so Sai was in a good position to get where he is now.


@Abdula: are you trying to downplay the reaction from Sai who, otherwise, is a pretty emotionless person?

Of course its not just a bingo book....not only should Sai already know that everyone in the base are traitors, but it shouldn't be a secret to Oro or Kabuto either. It has to be something far more specific and far more revealing of Sai's true objective.