I feel that usman has already thought about the complication of zain and Aliya's relation and suriyas intentions. It was shown during the marrige that the mehar aka alimony paid to the bride in case of divorce was not disclosed. I think usman might have written that In case of divorce Aliya will get all of zains share in property. This would be a master stroke what say. If this happens suriya will never let zain divorce Aliya.😆