Based on that list Hono is the member we will see participate in cool songs. Seki hasn't performed other songs than Sekai. The idol song member of the group? I have a feeling she will participate in A-side when they are getting a idol song like Sekai was. Otherwise she will be in B-side and unit for a long time. B-side is still senbatsu so she won't be left out and Gana used to get space for two tracks on a single. Matsudaira is also behind the other 2gen members. As of now, Hono, Takeyui, Matsuri and Hiichan are in a good place.