I don't think Rikako fits s/mileage as much as I love her... but I do think that she would draw in fans.
I decided out of gen 20 I like Funaki and Kisora the best. I could see them in S/mileage. Kisora has a Kanana vibe.
I'm on the Hamachan, Manaka, Nanami train still though. I would also like Tagucci. The more experienced KSS should debut because they've been at this for a while.