I'm still surprised though. She's not super popular. I'm happy they are going to give her the opportunity regardless. A bit like the case with Sakura perhaps.
Riko from TF got a PB, it's not that surprising Rei got one after that.
As far as I know except for Fuku and Maria, Sakura sold more than the other current MM members? So who knows Rei might do better than expected. They still barely sell, these PBs compared to other groups so I just take them more as a push rather than "popular girls get it" these days. Haruna was more surprising to me, btw.