Either Yamashita Mizuki or Momoko will do
Well . Keya sent their Substitute centers that includes their captain and Hinata also sent their recognizable members like Kosaka and...
I don't think there's a huge gap between the 3rd gen core 5 imo . All of them are pretty good in merch sales and Handshake sales
Those members you mention ain't that relevant enough compared to the core 5
I don't think SakamichiAkb is necessary tho