Those are excuses.. Red Lightning is CoC, Black Lightning is CoA..
And Zoro never had no touch, visually and narratively, AdCoC is not Swordsmanship..
You can't say that manga are excuses, excuses are going to look for things outside of it, like colors.
The manga has to be perfectly clear to readers, keep in mind that we never really saw AdvCoC in color of Oda's fist except Zoro, so there is no point of comparison and if you want to use the manga in color, we have been almost three years delay, we cannot be waiting three years for answers.
Furthermore, there is a perfectly logical explanation that agrees only with the manga in which Zoro also does have those visual effects, which the majority follow.
It cannot be a coincidence that we learn a new power and a new visual effect appears and they are not related. The steles mark the AdvCoC. Neither the colors nor the thicknesses... the trails.
And Zoro has them and coincidentally he started showing them when CoC woke up. You just have to add 2 + 2.
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Do you know that Oda confirmed in an SBS that the attack that left Kaido's scar contained CoC?