Hmm... I wonder what other peoples' opinions on that roster are. Personally, while I find it a noble enough idea that they decided to get lots of representation from as many different "groups" as possible, overall I find the roster very... unexciting for the simple fact that you'll end up with some kind of rainbow pimp gang no matter who you bring into your party. For example, if you're trying to make an SDM themed group, you can't. There's only Patchouli. If you're trying to make a Moriya themed group, you can't. There's only... er, nothing. If you're trying to make an Eientei themed group, you can't. There's only Kaguya (though you can at least make a Kaguya Mokou Keine group, I suppose). If you're trying to make a Myouren group, you can't. There's only Nazrin. No Yakumo team is possible, or hell, even an Oni team since Suika's not there. I guess you can make a "mostly finished" Satori family team (but no Koishi) or something.
But mostly, in the end, while there is at least one character from every "group" in the roster (...with the exception of Moriya, hehehehe), you'll end up with a disparate party of Patchouli teamed up with Nazrin teamed up with Kaguya teamed up with Komachi and kinda thinking these girls interacting with each other is something straight out of a ridiculously random fanfic.
But maybe that's just me. Dunno how others would feel.