Premades in Front have limited impact since they are capped at four players per team. Even if you queue with more than four friends, it's highly unlikely that you'll end up on the same team or side...
However, in Rival Wings, having just a four-player premade is already a huge advantage. When multiple premades stack on the same side, it completely breaks the balance.
Rival Wings should either prevent queuing with friends, apply the same restrictions as Front (1 to 2 players max per group, meaning half a light party), or at the very least, ensure both teams have an equal number of premades instead of stacking them all on one side.
This mode is already dead for three and a half months every patch, only coming back to life thanks to the Moogle event… I know it is maybe to much asked for such a niche content... But people take advantage of this every Moogle event.
Instead of reviving old Frontline maps, we could have a properly balanced Rival Wings, making it far more engaging. >.> Also yeah i do understand that it need more than that to make it... alive some sort...
EDIT : as an example on how unbalanced is rival wings compared to front... as a "solo" player i have a good ratio 1er / 2nd / 3rd being almost 33%/33%/33% where Rival Wings 20%win / 80%loses