Talk:Morning Musume Tanjou 20 Shuunen Kinen Concert Tour 2017 Aki ~We are MORNING MUSUME~/@comment-2A01:E34:EE7F:F240:2134:7254:DA81:ECB8-20171122214144/@comment-32742622-20171210175718

Personally, I believe it was more about how Nono didn't have much presence in that song. The intro quite literally is just Reina > Aichan > Sayu. And that intro's basically the core part of the song so the current MM can handle the rest. Had Charmy been there, she would've joined the song due to her speaking lines.

In other words, they chose songs depending on who showed up: Shabondama for Reina, Resonant Blue for Aichan, Suki da na Kimi ga for Sayu (matches her solo style), and W for Nono ('cause no main prescence in any MM A-tracks). It's not so much about how recently they've performed on stage (has Aichan been doing much?), but rather what they're more memorable for.