I would have wanted Sai to know the truth and not be fooled by him again. But that will lessen the drama element.
However, the downside is that it will also kill the impact of their face off. If she knows of P, she will not even give him as much as an acknowledgment. But here she will give him an earful. And V without his bondage (P) around will be in a more free state to express his feelings.
3