I don't know if it was predetermined who got to sit in front of each member, but if it were first come first served, I would've made a mad dash for center seat in front of Mayuyu.
I don't know how Mayuyu hadn't had a challenge until now. I mean the show went back to members who were previously shown and Mayuyu still hadn't appeared. Looks like she'll get her chance next episode. Another highlight for next week, Suuchan's belly dance (and outfit).