I just realised that in both the PoPiPa and Roselia ch2 events, the 4*s are the vocalist & the bassist, the gacha 3* is the drummer, and the event 3*s are the guitarist & keyboardist.

I wonder if that's coincidence or if it's gonna be like this for every band? my prediction for PasuPare was Aya/Chisato 4*s, Maya gacha 3*, and Hina/Eve event 3*s anyway which would fit. hmmmMMM