Agree with you.I never ever felt that raghav was at fault because he was very clear that he desired her beti and that meant biological daughter.Moreover,he had his eyes only on Kalpi through the entire conversation.As to why he did not go to the chawl with Sammys parents,one must understand that he has always lead a life of solitude and is not comfortable with the social niceties,he says so himself.In fact,I felt that him opening so much in feont of Kamala itself was a major step on his part.It was proof of his love for Kalpi because he did it only for her.
the whole Mu track is because of Paaki wHo planted the seed of a probable involvement of Kalpi and Sammy in Kamala's mind and dumbla ,of course,for never asking her daughter the guy involved but proceeding on pooki's presumtion.To top it all the crowning glory,was the dumb pair trying to ask Raghav's hand in a public function held in kalpi's honour.talk of truying to steal the limelight away from the one who truly deserves it...paki always does it and that is precisely the reason why people call her selfish .After watching that episode ,I fully endorsed it.
All the more reason why it should be Ragna.its not done that kalpi always never gets her deserts