Considering Mira has been gone so long, she needs to get some of the spotlight. She's the leader of the "B" team, and she's not as bad as she seems. I have a whole backstory for her and Arim, but that's probably for later. Evilyn's situation is more urgent.
Evilyn has been confined because she has a dangerous power she kept secret. Clearly, the rest of her team already knew.