I think that would be the best option. Rohit exposing Richa ! Case would be finished fast and Richa schemes would be revealed to all.They could show Rohit coming to the K-R marriage with the police. Rohit exposes Richa. Everyone is disgusted but above all , they feel rotten about the way they treated Siddhi.By the time Kunal reaches the Jail, Siddhi has left town without any traces ( As rohit has surrendered to the police, all charges dropped against Siddhi and released.)