Honestly I am even ready to watch the show even if Ekta brings Shakespeare work in Kyunki provided it should be interesting with good performances which the Vaidehi track does not have at all.
If Shiv's entry is useless then Karan's entry as Mihir's illegitimate son,Ansh's entry as Mihir's long-lost son,Nandini's entry as to fit in Ansh-Nandini-Karan love triangle, Tanya's entry to break Karan-Nandini relation,Tripti's entry or re-entry just to break Sahil-Ganga relation,Vaidehi's entry to ruin Viranis,Karan-Nandini's son search tracks were also not required as far as I see.For Parth's track they could have shown that Nandini miscarried while she was in prison as it generally happens with many preganant women serving jail term.
Why to afford another actor??
The reason is to keep the viewers glued with Kyunki with the changing storylines and to continue the show. Previously I had no objections with Vaidehi's character but honestly her not-so-good performace & boring proceeding of the track made me write all the crap against that track.
At least after watching Shiv-Ganga track, I am happy that it is interesting as well as good performances are given by both Yash Tonk & Shilpa Saklani in their respective characters so far. So I have no issues even if Ganga's ex-lover appeared SUDDENLY OUT OF THE BLUE as long as if keeps me interested.I have the same expectations with the Parth's track.