I don't think Zoro had a sword intentionally made for him. Rather I think due to an odd twist of fate Nidai Kitetsu accidently ended up his Birth Sword.
Zoro's story is tied to the Kitetsu Blades. Which is why I believe all 3 of them are meant to be his true swords.
theres no way that's really her sword. im sorry lol. if it was, she'd have been buried with it.
You're ignoring the very obvious conclusion that Kuina was GOING to be buried with the sword but that didn't happen precisely
because Zoro asked for it.
As Kawamatsu says here
It wasn't time for Kuina's sword to sleep yet. Since it still had a purpose to fulfill.
So when that purpose is finally fulfilled Kuina's Blade can be put to rest and finally be used to mark her grave.