Couples of points that I have been thinking:-
Mandar is now very desperate to get Pallavi divorced from Raghav & remarry her. He basically has pulled off his decency mask from his face in front of his mother & Pallavi. I have a feeling just like Sunny's analysis that he is just pretending to be an obsessive lover, but obviously he has a lot to gain if he gets married back to Pallavi. What the final reveal would be remains to be seen. I hope cvs don't disappoint.
Next, Raghav & Pallavi seem very confident of handling Mandar. For Raghav this is very much possible, but has he done enough background digging on Mandar with regard to his disappearance & re-emergence?There are too many questions in the story spun by Mandar & the doctor. How does Ved fit in all this? Again remains to be seen, I hope Ved is not forgotten by the writers.
Sunny, seems to be pretty intrigued by Mandar's obsession on Pallavi. Why? He is after Keerti's isn't that enough. If finally Pallavi & Sunny happen to be related to each other, it will be some very good story telling.
Now, for the next track it would be absolutely interesting to watch if Pallavi is also related to Krishna Rao. Raghav & his family will have to walk a very tight rope here between the person they simply adore & the man who destroyed their own family. Pallavi also will have condrum of emotions & revelation(we viewers will get to see minimal D family drama), if Raghav will go on a revenge trip, which he obviously will. I am actually waiting for this to happen.
Now, everything depends on some real good scripting & execution. From this point onwards the story can move in any direction. I just hope Mandar actually leads to an interconnected part of Raghav & Pallavi. Fingers crossed!!