I think it's fix that Mao is the next representative from Tsubaki in Dance Club (if it continues )
That was an easy call. Nevertheless I am very happy about it.
From H!P wikia (Hello! Project Station Dance Club):
From January 3 to February 19, the dance club will perform during Hello! Project 2017 WINTER ~Kaleidoscope~. On the first day of their performance, it was revealed that Ikuta Erina, Murota Mizuki, Funaki Musubu and Akiyama Mao had joined the club.