This is one theory I can understand. I like the idea of Rohit being a coping mechanism for Myrah. I want to go even further and say that maybe Myrah and Rohit were married and maybe even had a child, And maybe Rohit and the child are both dead so she's blocking her memory after the marriage, where she fell in love and had a child. She's retained the fact that they were friends and that her parents had gotten them engaged but nothing more so as not to burst the bubble of her imagined reality. Her uncle could also be extra cautious of her for that reason as well. Safe guarding her not because she's in danger from an outside threat but so that someone is keeping an eye on her so that she doesn't hurt herself. Maybe the family or just the uncle is treating her with kid gloves because at least in the state that she's in, she's at least happy. The only reason I see her as a mom as well is because of the pauses that they've put in after her meetings with Dhruv, as if she's remembering something. It would also put both Rudra and Myrah on equal footing, as they would both have lost their soulmates, making them both reluctant to act on their attraction to one another but also it would give Myrah the extra incentive to be a mom to Dhruv. I'm not sure this is what the CVs have planned but it would be an interesting twist.
Some of the theories that Rohit is Shantanu kind of seem a stretch because Rudra shot him in the heart at a very close distance so him being alive would be so hard to believe. Paro still being alive, it's possible, if she lost consciousness due to shock (loss of blood), went to the hospital, was saved but Rudra was still made to believe she was dead. But why would an Industrialist father or Chief minister uncle want to make her a daughter/niece, If she had property wouldn't it just shift back to the parents if she died. I could see someone fake having a son where their property/industry continues the family name. But a daughter whom leaves the family unless it's for political gain on the uncles side that he's marrying her off to some influential family to up his political career, but even then would he have the patience to wait 7 years to get her married off? It's really hard to see the motive. Unless the family was made to be fooled as well, maybe the Myrah was in an accident and the doctor knowing the father/uncle are involved with illegal activity couldn't save Myrah but thought his/her life would be in danger if he didn't say Myrah was alive so s/he lied and gave them Paro instead.