Zoro saved Luffy 3 times in this chapter.
First from Big Mom's attack
Then from Kaido who had Luffy chomped in his mouth
he even hurt Kaido from the attack which surprised Big Mom as Zoro was able to cut him and even Kaido acknowledges the attack.
and again saves Luffy from Kaido's Dragon Twister Gale of Destruction while also dodging the attack
Why these are impressive would be explained by a person much better at wanking and writing essays on Zoro than me,
Mr
@Cinera
Here is the post why