Rizwan might become a part of a way to get Aliya kicked out of the house, seeing as he does side with Aliya sometimes, he might under nafeesa's influence play a role similar to khizar in humsafar (basically making it look like rizwan and aliya are having an affair making zain hate aliya more)
Though it's a possibility, reasons why it might not happen is because rizwan seems to have no motivation to do this, nafeesa probably wouldn't want her brother to lose his friend.
But you never know circumstances might change 😲
Another prediction based on what I've seen so far, Usman saab will punish zain for creating a tamaasha on valima day and possibly notice how Suraiya may be involved to Aliya stealing/ Zain being inebriated and banish Zain and Aliya to a far away place (read: honeymoon) so they are forced to spent time with the people they hate most (each other) and sort out their differences w/o suraiya's interference
Also the above ridiculous theories may have been brought upon by a lack of sleep 😛