Where’s Xebec’s black blade and WSS title?

Why would rookie Xebec make a black blade
Does 20 year Old Zoro have Black Blade and WSS title??
Although Xebec Prime Probably is still not as strong as Mihawk and his CoC is not strong enough to make Black blade.
Having strongest CoC is the sole requirement for a Black blade so WSS defacto would have strongest Haki.
Shanks Probably has more pure skills than Mihawk because he can adjust his sword style to non-dominant arm..but Mihawks CoC HAS to be stronger than Shanks for him to be WSS.