I was relooking at the colorcode with the song, and I just realized the the three person to one line makes sense. Ogawa and Kon are both in those two

And when they leave TAKA/RISA DUET! Yay! Not that I want to see Mako leave
I wonder who is going to get all her lines when she leaves. She took quite a few of everyone's when she left (Kinda like Yasuda). Especially the songs they play ALL THE TIME at concerts likes Mari's in Love Machine, Goto's in Renai Revolution, Abe's in Peace as well as quite a few others

I'm thinking Miki/Risa/Eri (not in order) as to who the main people will become. I mean, Takahashi never took leads in two of those songs, so why would they do it now?