Meeharika,
Yes. The concept of getting conceived for another woman ( in Kalki )is silly, unacceptable and horrible thinking on the part of KB.
Yes, on Pudhu pudhu arthangal also, Rehman and Sitara will behave like lovers but suddenly they will give up after change of hearts. Probably KB did not know how to end that deadlock. This again proves my theory that KB is poor finisher.
Even Arangetram also, he will make the heroine a lunatic at the end. BR would have made a more realistic acceptable end to that movie.
The only positive movie I had seen from KB is Vaanamay ellai. A good object lesson for youngsters.