Go back and read my earlier post. It explains how you're wrong with the first part of your post
yet narratively oda makes zoro say that he'd get stronger after he mastered a sword that grants him more haki exertion.. and he changes it with shusui.. when zoro could have returned shusui after the arc..
edit: the logic being if shusui is capable of doing what enma does then zoro shouldn't be much stronger... but if you wanna argue that shusui can't draw haki like enma.. then it wouldn't make sense for zoro to be equally capable with shusui when it doesn't offer the same attributes..like why does zoro claim that he can get stronger by repeating the same with enma...
it is narratively put in place that zoro is highly contingent on enma to damage kaido... from panel to panel.. from comment to comment... enma recieves more recognition than zoro
First, Zoro having enma using doesn't automatically mean he can Kaido. When Zoro first attacked Kaido he didn't cut him. That alone proves the ability to cut Kaido comes from the users (Zoro), not the sword (enma). I almost believe Oda did that on purpose to squash the belief enma is the reason he cut Kaido.
... I'm pretty sure zoro said he hasn't exerted most of enma...meaning the haki he drew in it wasn't enough.. and he doesn't mention his other swrods that he has mastered more profusely obviously...
Kaido doesn't mention wado and Sandai when he gets cut... he doesn't mention how those blades were able to cut him.. he also doesn't mention how other blades have the same oddity and feeling like enma since it takes zoro's haki... this is not to prove that ODEN HAKI IN ZORO SWORD WOW... this is to prove that kaido distincts enma from the rest of the blades mind you he has mastered completely
Swordsman grow stronger with new swords but that is after they master the sword. That comes from properly controlling the sword. If the user cuts too little or too much with the new sword they haven't mastered. Zoro hasn't fully mastered enma. He is stronger with enma then he was when he first obtained it but still has ways to go. Remembering, what true makes swordsman strong
so.. mastering a blade of the same rank should be easier... if cutting and not cutting is what makes a swordsman master a sword.. even tho you are not taking into consideration that zoro was struggling with enma drawing haki... and not it cutting too much like Sandia.... its different for different swrods... one cut too much.. one is heavier, one draws exponential haki... cutting and not cutting isn't the right metric to see if anyone can cut and not cut ONLY.. not that it isn't a factor.
Zoro without enma but with shisui would perform similar.
he shouldn't be "MUCH STRONGER" after mastering enma then.. it doesn't make sense of he's able to do the same with shusui...
that's a narrative fallacy
When Zoro used Dragon twister he cut Kaido with all three swords. That is a 3 sword attack. If he wouldn't have cut Kaido with all 3 swords then he would have commented on it. The manga even hints at Zoro ability to cut Kaido way back when he cut the dragon during punk hazard. That's why that feat is compared to Ryuma's feat in the official one piece magazine and even ask if Zoro will repeat Ryuma's legendary dragon cutting feat in Wano.
.. the PH dragon.. and the ability to cut it...
luffy was punching the shit out of that thing doesn't mean he'd be able to punch kaido around while damaging him... that false equivalency... tho i agree the Ryuma parallel gleams the most there.. but that still narratively shusui cutting the dragon... if zoro was able to replicate it.. oda wouldn't have had him change swrods...THAT MAKE HIM MUCH MORE POWERFUL THAN HE IS RN MIND YOU.. when he coukd have had a romantic moment with hyori where where she calls him "zori-kun" and asks him to return it and he gifts it back after replicating Ryuma's legacy.. again narratively inconsistent arguments
and bro let's not even get to zoro using a certain number of swrods to cut yet it lands one slash...
Zoro uses 9 swrods.... and he's seen lifting enma (in his right hand) in a posture that indicates a post-cutting stance...... so zoro cut Kaido with Enma YET AGAIN.. and it even causes one scar... so zoro using 1 sword give kaido 1 scar..
idk if we can use this perspective on other moves which are way more ambiguous but this is an obvious visual blatantly screaming at you... that I FUCKIN CUT THIS TUNA WITH 1 SWORD BITCH.
and about zoro having ryou... until its mentioned I'm not ready to belive it.. Mr 1 argument doesn't logically sit right with me... it like saying since the sky is blue and the ocean too... sky = ocean