There can be only one Asha, only one female cop ever to be on par with Daya and Abhijeet.
Her age also made it work at that time....Ashwini, Dayanand and Aditya are probably around the same age. So, they had a wonderful chemistry.
The later girls were too young...think of Muskaan - Abhijeet often treated her like a kid, calling her 'bachchi' and all. The later girls could never be on the same wavelength as Daya and Abhijeet.
I would have loved to see her continue....I would love to see a real female colleague with Daya and Abhijeet who can sit and have a nice friendly chat with them. We will never be able to accept any actress other than Ashwini in that kind of a role.
Maybe if Asha could come back, it will definitely help solve the present problems of the bi-weekly stuff. I wouldn't mind if Daya or Abhijeet took a day off and Asha took over the proceedings, but as an actress, Ashwini has her own choices.