leaf-jett/neon/kayo/viper
zellsis- raze/kayo/breach/KJ/viper
yay- chamber/jett
xeppa- fade/sova/skye
vanity- smokes
ascent: yay-jett, leaf-kayo, zellsis-kj, vanity-omen/astra, xeppa-sova/fade
bind: zellsis-raze, leaf-viper, xeppa-skye, yay-chamber, vanity-brim
pearl: leaf-neon, zellsis-viper, xeppa-fade, yay-chamber, vanity- smokes (leaf and zellsis can switch)
haven: leaf-jett, zellsis-breach, xeppa-fade/sova/skye (they all work), yay-chamber, vanity-smokes
breeze: leaf-jett, yay-chamber, xeppa-sova, zellsis-kayo, vanity-smokes
fracture: zellsis-raze, xeppa-fade, yay-chamber, vanity-smokes, leaf-viper
icebox: yay-chamber, xeppa-sova, vanity-viper, leaf-kayo, zellsis-sage (leaf and zellsis can switch)
lookin way too good
The only potential issue would be when chamber goes out of meta imo. Also I'm not sure who's picking up the sova/fade duties. Could be any of Leaf/Xeppaa/Zellsis tbh, but none of them are purpose built for that. I think Trent instead of Zellsis would make more sense but they're all incredibly flexible players who hard carried their respective teams, and I'm sure they'll do well together (if they can get Sykko as coach or something even better).
C9 biggest hurdle this year was chamber meta, but now with yay that will be solved. When chamber goes out of meta, they still have 3 potential top tier flex in leaf xep and zellsis. Trust me on this leaf can play any agent and be a demon, and vanity is still one of the best igls and yay is the diablo