Yeah I guess it makes sense, she’s been in discussions since the end of 2018 just as Kana and Rina had, it shows how much Ayaka graduating held back. Of course I’m sure Ayaka hadn’t meant it to go this way. She was the Leader and one of the last OG S/M - ANG member, and Funaki had discussed it while the future of CG was in discussion in late 2019, so I guess it make sense that Muro graduates before Musu.
I swear if after Musu, Rikako suddenly announces she is graduating, I won’t be surprised if she also had discussed this late 2018
. All that is left is Akari and then all S/mileage members will have graduated.