They brought him back with lot of fanfare before leap. He also gave interviews on how excited he was to be back.
When he came back initially there was nothing about leap and then suddenly everything changed. Rishabh returned from Canada, stayed around for barely a week and now he is in London on business.
So they will bring him back, I think after BL marriage track is over..
If they didn’t need him in the show they could have done it by showing Sherlyn tried to kill Preeta. So Rishlyn divorce happens, he leaves for London. But they didn’t do that, so they must have promised him a good story track. Now waiting to see how much of what was promised is actually executed.