1,as in the precap we saw that rad was trying to explain that as dev's body is not found,,so it cannot be assumed that dev is dead,,,so now santanu will try to bring a dead body and prove it to the family that its dev's body,,and may be after that rad will be forced to be a widow or she might find that something i swrong and get the clue about the murder mystery...
2,as somebody was discussing that santanu may convince everybody that he will marry rad and then become the RP...
3,,santanu may also try to prove that rad has become mad and cannot carry the responsibilities and then try to achieve the RPship...
lets see what are the things in the CVs mind,,i just want to see dev return asap...