If Emma and Regina are going on a road trip to find the author by 4×19, then I’m guessing the Queens of Darkness are vanquished/defeated by 4×18. Because there’s no way Emma would take off on a road trip before QoD would be taken down.
6 episodes isn’t a long time to take down 3 villains and incluse their backstories.
Pan got 11.
Zelena got 9.
Ingrid got 9 or 10
QOD aren’t going to be that much of a problem if they’re down in 6.
[adrotate group="5"]
All magic comes with a price!
Keeper of Felix