- All the times Zoro helped Luffy on the Rooftop -
(I also didn't count a few times Luffy got saved by Law, he did once even before Luffy lost haki, so Luffy should've reacted first)
1st: Zoro protects Luffy from Big Mom's Prometeus Attack
2nd: Zoro protects Luffy from the Blast Breath
3rd: Zoro saving Luffy's Ass after using his Haki in Gear 4th against Big Mom
4th: Zoro cuts Kaido dragon form to make him release Luffy from his mouth
5th: Zoro once again saving Luffry from the Dragon Twister by Kaido
6th: Zoro saves Luffy and the rest of the Roof 5 by blocking Hakkai to by enough time for Law to take everybody out of there (notice how Luffy notices it first, but Zoro is the one that reacts and takes the decision to block it).
7th: Kaido is standing above Luffy, readying himself to hit him on the ground with some attack and finish him off, thinking about he is going to do. Zoro takes the attention for himself and uses Asura / CoC to scar him.