I dont know if this theory have been posted before but but me andsukhi were thinking thats possible......
They are getting this Vishakha and the actress hasan experience in acting where as this new Kasak did not show any calibre in acting......... and if the new story was related to kasak..... then this kasak would have been some one who knew acting...... while this new vishakha has an experience in the acting and is not a new comer.........
Also Aditya said "kal saari duniya jaan jaayegi ki mera tumahri beti se kya sambandh hai" So its quite possible that Vishakha had an affair with Aditya and had a kid and Prerna helped her...... and Bajaj does not know about this, he might have been out of town........ and he keeps on saying that MERA SAAMAN TUMAHRE PAAS HAI- IT MUST BE VISHKHA'S DAUGHTER........
Now to save Vishakha, she might reveal that the kid is her's or something like that and Bajaj and Prerna will have a fight..........