Any single CP9 could fight against swords, though. Oda could have made Kaku just a stronger tekkai user and fight Zoro just with it. It was an aesthetic choice to make him a swordsman. Even the first time they clashed Kaku beat Zoro with only shigan. Lucci is twice as strong as Kaku and demonstrated the highest tekkai ability among the CP9, taking Franky's Strong Hammer to the chest without moving a finger. Asura may damage Lucci, but there's no way to make the argument that Zoro could damage him without Asura (at the time) more than Lucci could kill him first.
You also have to take into account that Lucci didn't fall after receiving the first Jet Pistol either. He took several of them, a jet rifle, a jet bullet, a jet bazooka, a G3 punch and a jet gatling gun before he finally fell, despite taking the first hits without zoan nor tekkai. Zoro dealing more damage in a combo attack against a Pacifista doesn't guarantee he could take Lucci down on a single hit. Not that Lucci would just remain still either as he proved to be much faster than Kaku was, having his own kind of soru technique and all.
Take also into account just how long it took Zoro to go Asura against Kaku, like an hour into the fight, while it took Luffy less than ten minutes to be pierced by a barrage of shigans from a Lucci who casually walked through his gomu gomu no gatling avoiding the punches.
There was all that and there was also how the plot itself told us that only Luffy could take on Lucci at the time. Luffy and the crew themselves all aknowledged in that same arc how "it's Luffy who will take on Lucci because he always takes on the strongest because nobody else can" and the whole thing when Luffy was almost defeated that Lucci almost when on to kill Zoro and the rest and Luffy had to pull some Plus Ultra power to beat him. Clearly the whole point of that scene is that half-beaten Lucci was enough for the rest of the crew.
Factually wrong because tekkai wasnt enough to stop Zoro's swords. Stronger toughness than Lucci's was not enough to stop Zoro.
It is never an aesthetic choice, every single one of Zoro's opponents has a way to somehow deal with a sword instead of taking it with their bodies.
The first time they clashed is irrelevant. Luffy was one-shotted instantly as well, didnt stop him from beating Lucci next time they met.
Lucci's tekkai is irrelevant, Pacifista is incomparably tougher and couldnt stop Zoro's Asura.
Let's get it over with, stop bring up tekkai because it cannot stop Zoro. Check it up so we can move on from the tekkai argument.
Zoro didnt need Asura to keep up with Cp9's Soru speeds, Sanji didnt need it either, it was only Luffy who needed his PU to keep up with them.
Lucci cant kill Zoro "before he even uses Asura" just like he couldnt one-shot Luffy the second time he met him like he did the first time.
Strawhats at their first meeting werent even serious and were mentally in a mess since they didnt understand what is going on with Robin.
Once they found out the truth and got their minds focused on the task, they were completely different.
Why wouldnt he be able to take Lucci out in a single hit? Taking on Pacifista in a combo attack doesnt reduce the hardness of the material nor is anybody else helping him to cut it. It was all his effort to cut it, cannot be downplayed. Asura is by far overkill mode for any CP9 member, Lucci included.
He would remain still, it's shown on panel, his cockiness would mean his demise. He was stupid enough to take on G3 even tho he could have dodged it.
It took Zoro long to go into Asura because Oda gains nothing from Zoro pulling Asura in the very first panel of the fight and ending it instantly, that's not what the author benefits from. He is there to tell the story and make fights interesting, 2-chapters long instead of 1 page one-shot right away...
He can pull Asura whenever he wants.
No, plot didnt tell us that. Luffy said that if he let Lucci go he would kill his crew, Luffy at that time had 0 idea of Zoro's Asura which is by far superior to anything Luffy had at that point. Nobody acknowledged that... Usopp asked Zoro if they should go and help and Zoro responded that they should stay together to avoid separating again and clear the way for escape. We obviously disagree and I have manga proof that Zoro goes through tougher than Lucci.