For me, it's like it subverted my expectations, I had no hope left for Shiho, this makes all her past decision have an extra layer of conviction that justified some her actions better, but only some... While she's doing something memorable with her band, she's still deep inside a total bitch who's drive is most of the times just jealousy, ego and malice while the rest of the band pretends not to see.
Is like pretending that the spirit of the dead girl will only see the end result concert and not everything else.......Anyway, we now know why her band doesn't look like they're having fun playing, it's almost a curse.
I wish the author could've hinted that there was more to the band than just being better than anyone, because this chapter was good and needed, very nice in fact, but it comes out of nowhere too, in fact you could've made up any other kind of tragic past like "my sister only has a year left to live" or we're aliens and music will save our planet, and it would fit because there really was no indication of something else going on.