That is an exciting possibility. Infact when Ritik fell unconscious the other day, he could feel the guy imprisoned in that Devdi (now he's in some cave) calling him and saying "Ab tumhe aana hoga".
But I want to see as to when and how Ritik will come to know about the Naagmani. I mean he's still an ordinary person with no clue about any such past connections.
There should some trigger that should make Ritik realize about his connection with the Mani, his previous birth relations with Shivanya and his real father. He doesn't have any clue at all (right now).
Only then the three can team up for such a mission. Before it happens, even Sesha's misunderstanding and hatred towards Ritik should be resolved. There are too many loose strings right now.