My prediction for Dev watching video and aftermath- Based on Revenge

Dev is told as a good fielder and that means he is a defense mechanism. And you cant defend well unless you know completely how the attack will happen. Still Dev doesn't know the way in which Shaurya attacked him not once , but twice. Unless he knows this Shaurya can bump him of easily. So if needs to defend he needs to know. If he needs to know Durga should be forced to the hilt to reveal her true identity.

This tape viewing according to me is going to do exactly that. Dev is gonna go mad and he is gonna run telling he will kill Rajnath. Durga will run behind him. Anyway it is an emotional moment as anyone will feel angry and mad seeing one's father murdered in cold blood. He will not stop and the only way she will be able to stop Dev will be revealing herself or by confessing Nithya's feelings for him. Either way she will not have other option but to come clean in front of Dev. I mean she will have to tell all Ramkatha to him.

That tape was instrumental in uniting Raj and Sakshi in a deal type marriage and I feel that tape itself will be instrumental in breaking the deal around Devga marriage and bring them on the same page.

This is my understanding and I hope this prediction is true.

Nithya and Dev can unite only when Payal gets justice so CVs have gone with that theme.