Its not the sole one and yet it was introduced with the main aim that it's biggest feat is cutting kaido. Then it's revealed that only Oden could handle it. Then its revealed that Zoro can even surpass Oden by making the sword black.
Irrelevant because, again, it was proven that it was not the only sword to do so in the flashback that followed. It’s uniqueness was relegated.
I guess to you cutting Orochi is worth all this build up. Zoro gets compared to Oden but that's jut because Orochi was so strong that Oden’s strength seemed impressive to beat Orochi right? Zoro is given a sword which has its biggest feat as cutting kaido and zoro is said to be on the track to surpass Oden and of course the only way of showing all this instead of just telling us (show not tell) is Zoro cutting Orochi. Because Orochi is worth all this build up right?
When Zoro cuts Orochi, that will be the story paying off Tenguyama's comparisons of Zoro to Oden. This is your story. Good for you.
Given that Zoro cutting Orochi, who he actually has connections to, who he actually has a reason to do so, who he actually would have the strength to do so, which actually would make sense if he did so as opposed to the other option, yes, it would be quite a payoff, moreso than the other option to anyone that isn’t a fanboy.
Noting you said proves Zoro isn't cutting Kaido. Lol
I don’t need to prove anything, and I never said that I was.