I don't think if Q+RD become FJ,they can maintain it because,
1)See any all-boyz (backstreet boys) or all-girl band (Spice girls),they broke up after initial succecc.Reason is simple,i.e jealousy.
2)Rex always think he is better singer & QAZI can't dance.Even in group dancing Qazi toil hard to match steps.
So it is matter of time Rex will think "I am the boss of the jori" & should get greater mileage.
But in case of QAZI+RUPU there are no such risk.They will allow each other the much needed space & respect & gelling will come automatically as both perform together more & more.
So guys vote for
QAZUUUU+RUPPPUUUUUUU
QAZUUUU+RUPPPUUUUUUU