So in franchising we've had:
Lock in Sao paulo and Tokyo for Fnatic 2023: Boaster, Leo, Chronicle, Derke & Alfajer
Champs 2023 for EG: Boostio, C0m, Ethan, Demon1 & Jawgemo
Masters Madrid for Sen 2024: Zekken, TenZ, Zellsis, JohnQT & Sacy
Masters Shanghai for GenG 2024: Munchkin, Meteor, T3xture, Lakia & Karon
Champs 2024 for EDG: Nobody, S1mon, ZmjjKK, Chichoo & Smoggy
Masters Bangkok for T1 2025: BuZz, Izu, Sylvan, Meteor & Stax (& technically Carpe)
Masters Toronto for PRX 2025: Patmen, F0rsaken, D4v41, Something & Jinggg
I think if you count Carpe, it's him. Not even flaming him as a player, but he played only 1 series, where he didn't play all that good. He's the 2nd lowest rated player for that tournament. Otherwise, I think it'd have to be between Lakia, S1mon and C0m. They all played a super supportive role for their team, and made them not play nearly as good individually. My shout would have to be Lakia, even if he played pretty dang well.