Luffy coats one arm, Zoro coats 3 swords.
Plus Zoro enters haki state King of Hell where his CoA is creating fumes.
Not a single character releases as much haki as Zoro does.
Delusional or not, Zoro is representative of Power among the 3 triggers.
Luffy will have to get satisfied with Fame but idk if Luffy fans will be.