#sorry i was reading about isumi scoffing at how kujo is the biggest failure of all (i am SO proud of him for that btw)...

[always-a-joyful-note]

Actually, Zool was SUCH an important addition to this story just narrative-wise. In the last few parts we've basically seen the topic of change and endings tackled alongside the desire for eternity and sameness and how impossible it is for a human to fulfill those expectations. So here comes Zool, a group born out of a desire to destroy idols and expose their humanity in the ugliest way possible, made out of four people who have been deemed failures by society and/or their own selves. They were not a good group but they changed and became sincere in their pursuit of music. Their whole redemption is just basically a big flashing signpost that tells us that change can be good AND still co-exist with the desire to last, even if it turns out that they can't last.