>>23107462Yuuna and Meru have been pretty upfront in their statements about how they'd been considering leaving for a while, but I think the circumstances of the past few weeks probably pushed them to leave earlier than initially intended.
As for Kallin and Mio, maybe it crossed their minds a few times but I don't think either of them were seriously thinking about it until Urara left, and then finding out that the other half of their gen was leaving on top of that probably solidified the decision.
