Kkusum might find out about Mahi's stay in Malaysia living under a different name. (Mahi told Kapoor's that Tasu had kidnapped her when they thought she had died)
Also Mr Raichandra will help Kkusum in getting the business etc back from Mahi.
Seems there is a twist in the story and that is why the main characters have been moved to Malaysia. When they come back to Mumbai they will have some triumph cards to play against Mahi.