>>57175582Reine's number had nothing to do with groups. Two of her songs were just performing with IDs (one for her gen, another for the entire ID branch). By that logic, literally every girl should have at 2 at minimum, but a lot of them only got a single performance, some of them not even with their gens/branches like Amelia.
There's probably no legit argument that went into this beyond availability or something. 1 was the minimum and a lot of talent may have just not volunteered to do more.