>>12754827They need a good combination, Mori/Gura/Anyone, and Mori/IRyS/Anyone, are good. We just need either Gura or IRyS on one, and it'll be great. The problem with the 3rd one is that Mumei didn't get the same airtime as Bae for it to be a legitimate trio.
A counterpoint to this is that Mumei had better stories than Bae, but it's much shorter.