>>92648756Objectively correct answer is that Gura leaving will seem worse to a casual observer, but Mori leaving would be infinitely more alarming to anyone who looks past noombers.
Gura is basically dead and has grown big enough to not care, but Mori is a massive workaholic who has a lot of ties to Cover and her career hinges upon them. For her to leave them would mean something's seriously fucked enough to make her consider that the better option than staying. Things get worse when you remember how other members view her.
It would be akin to Selen or Pomu leaving Niji. They weren't the top earners, but they were very dedicated to a company that wanted to bury them.