Zoro can't use haki on his body parts easily as lufdy does
its a crutch for Luffy. for any brawler. necessary so they do not get dismembered anytime someone swings a butter knife their way.
we will rarely ever see a swordsman block with his limbs. coated or not. its not what swordsman do. they block with their weapon.
Luffy has no other choice than to block with his limbs. conveniently hes steering clear of almost all bladed weapons. well, or he gets overpowered by them. like with Cracker or with Katakuri. even Hody. Doffys slicing attacks also cut him up good.
He doesn't have that haki control...
Zoro during the TS learned to control haki in a way that Luffy barely just learned now. hes more experienced and already pulled of feats with this technique while all Luffy did was clap fodder and punch a tree.
Zoro busted a mountain and cut off a cliff. theres a huge difference in what we have seen boths CoA do and Zoro is pulling a landslide victory so far.
Thats why zoro even asks franky to shield him
Zoro is yet to use coa as fluidly as Luffy does
why waste haki when you have someone immune to most projectiles close by? Luffy would have wished for a Franky shield any time Doffy cut him and he failed to block himself. oh, and Luffy cowered behind Zoro when Hawkins attacked. so much for that.
its a moot point.
clearly asked you for the panels of Zoro using haki to block attacks.
sorry. you ask for something that does not exist.
anytime Zoro used ryou his enemies fell. one of them another Supernova.
not much to block if any of Zoros inferior haki ryou moves one shots.