Why are Biboo and Gigi the only ones who can form multiple duos?

*GENERAL NUMBERFAG SITES*
>https://playboard.co/en/
>https://ikioi-ranking.com/
>https://vrabi.net/
>https://www.vstats.jp
>https://live-ranking.userlocal.jp/vtuber-ranking
>https://vt.poi.cat/

Hololive sites
>https://www.hololyzer.net/youtube/index.html
>https://trackholo.live/en/
>https://holo-spotify-stats.jirikunes.eu/

Twitch sites
>https://sullygnome.com/
>https://twitchtracker.com/
>https://stats.roki.sh/
>https://streamscharts.com/

Sex sex sex

Brats