While luffy has the ability to attract people to his cause, Zoro is the master of teamwork, he has the ability to direct his allies's strength to a better use, from using usopp as a sword to using orlumbus and king elisabello in his tactic n°5, and inspiring every capable person in dressrosa to push the bird cage, to making use of law's power to protect his captain on the rooftop.
My man zoro made note of sai's strength, and the happosai navey, he's very perceptive of the power of people around him.
Literally no one in the whole series showcased such feats, it's probably like ivankov predicted because of their conquering spirit.
That's why marco and sanji couldn't be of any meaningful help to each other.
Now that zoro inters the fight, the atmosphere changed drastically, even sanji is smilling having someone like zoro by his side, when just a second ago he was complaining about the difficulty of the fight.
:cheers: