1 - when rashi and her mum were gloating after urmi got off the phone to elesh, they panicked when they realised dhawal had heard them... if he was like them then they would have let him in on the secret too....
2- in the same scene dhawal told rashi to go do some work....if he was anything like rashi and urni then he would have preferred his sis to chill and get away from doing any work like urmi is
3 - if he was on the same wave length as rashi n urmi then rashi would have called koki kagdi and not stopped mid sentence and corrected herself and said kaki.
this is just my opinion.
i also think that after everything is out in the open, dhawal will jump in and save the modi parivaar izzat and marry kinjal, and maybe, just maybe koki will start to like him because at the moment he hasn't done anything to be disliked about. i think dhawal and kinjal marriage is on the cards coz why else would a new character be introduced when the show is doing absolutly fine without him.