What makes this game fun is the different squad combinations people can create. But when you have one toon overly strong it ends up in almost every squad and dictates how the squad is built. Rey and RG are in 3/4ths the top 100 squads. You've reworked RG already, so Rey should be on the table to be reworked next.
With Leia being released to shipments, it's going to turn into the Leia, Rey, and RG show. All the top squads will be running them, probably with Daka and a variety of different leaders.
The only creativity is going to be with what leader you chose. Lower her attack and it will open the game up to more creativity in squad building.