Did you forget about the part where Zoro is not willing to give Shusui back to Wano?
May be he unconsciously being possessive of his great great great gramp's sword.
So? if the story confirms that's it i won't like it either, but that wasn't the case there, Zoro said he didn't want to give Shusui because he EARNED it by defeating Ryuma, he doesn't care if it's sacred to them or anything.
And he did ended up giving it away after he understood the reasons behind it, so?
You jump from one thing to another completely out of nowhere, you either just baiting or throwing random shit at the wall and hoping something sticks.