Yes atominis that is Dayal's plan. Pack of Dev and Durga to US. Dayal is attached to Nithya as he sees his daughter Durga in her.
Dev though talks about justice for Payal his eventual aim is to find Nithya. So if he knows Durga is Nithya ,he will marry her and can be coaxed to return to US.
Most probably Payal will be taken for care in a US hospital and Dev and Dayal would try to give her a normal life by marrying her off. I mean you can call it a solution. In a way Payal too gets a life and Nithya too gets a life. Goenka's wont disturb them as long as Dev does not create any problems for their so called waaris by staking claim on the Goenka empire, which we know Dev wont.
But Durga tells she does not want opportunity to be ahead of the mission. And she is correct too. Maybe today the US will be safe, but tomorrow for another flimsy reason Shaurya can do something and the father-mother duo will go any extent to protect him.
From Durga's perspective I feel she wants both men that is Dr Dayal and Dev to know one thing. She wants punishment for Shaurya. She wants proper justice for her sister Payal and she is willing to go any extent for that.
If they want her, they can get her only if they support her mission of justice for Payal in the way she thinks is the justice, not the way they think justice is done.