Adv CoC is also haki. Stop kidding yourself. The very strongest use it- and that can include swordsmen just fine. It's not some divine additional weapon which is shooting bullets.
You can enhance your swordsmanship and sword attacks with it, so it's a part of your swordsmanship. As simple as it gets.
There's nothing as "kick user". You're either a brawler, or you're a swordsman. A brawler can incorporate sharp attacks into their arsenal (Lucci) while a swordsman can incorporate kicks and punches into their arsenal (Zoro) ocassionally. But all in all, your main fighting style and stuff decides what you are. Shanks has 312984782397498238947239873298749823 portrayals and statement that inches him towards being a swordsman, and zero towards non-swordsman.
You can enhance your swordsmanship and sword attacks with it, so it's a part of your swordsmanship. As simple as it gets.
There's nothing as "kick user". You're either a brawler, or you're a swordsman. A brawler can incorporate sharp attacks into their arsenal (Lucci) while a swordsman can incorporate kicks and punches into their arsenal (Zoro) ocassionally. But all in all, your main fighting style and stuff decides what you are. Shanks has 312984782397498238947239873298749823 portrayals and statement that inches him towards being a swordsman, and zero towards non-swordsman.
Lucci isn't a brawler he is a martial artist. Sanji is a martial artist too. Luffy is a brawler, Shanks and Roger are brawlers who also use weapons.
Shanks is portrayed as stronger than Mihawk, while Mihawk has the title of WSS, that is all you need to know to undestand Shanks is not a pure swordsman.
The primary portrayal of Shanks is actually his CoC haki, not his swordsmanship, from the seaking initially in the very first chapter, to breaking WB's ship passively, to using adv CoC to split the sky against WB, to using CoC to passively knock out Coby while defending against Akainu.
Zoro hasn't used a kick or anything aside from his swords except out of desperation/ gag. He doesn't have a named kick attack and it isn't part of his fighting STYLE.