The only ones left at the time would have been AKIzuki Ritsuko and AKIzuki Ryou, who are of dubious Cinderellaness, though they've since added Sunazuka AKIra.

(To the western eye a number of other idols would count, but to take Saki herself here as an example, the name is SAKI, not sAKI — さき versus sあき.)