Sanji is a distraction tool, that saves people by drawing attention to himself. Zoro is the main combatant.
Okay but be real with me.
Has Zoro not been portrayed downright stronger than Luffy this arc?
Luffy uses Joy Boys Sperm and Full Power and 3 Named attacks and Lucci gets one bandage.
Zoro uses his Base Form and No CoC and one hit and Lucci is on same state as Whitebeard was at the end of Marine Ford.
Then Luffy goes Nika form again and gets embarrassed by a Gorosei while getting help from 2 giants.
Zoro faces an even stronger Gorosei and matches him blow for blow.