OK this could just be a translation ambiguity but Starra's early announcement made it sound as though the three girls are going to be placed in one single group, whereas Amped quote of Momoko's comment directly above seems clear that each of the three girls will go into a different group. Particularly here: "and I want them to be the most outstanding members in each of their groups." Which kind of makes me sad. I'd prefer to seem them stick together, especially considering the chemistry of Nanami and Musubu.
My overall impression is that CG are being Buono!ized. And by that I mean, unfortunately, the Zetima-era Buono!, when their activities as "Buono!" became increasingly minimal.