Excuse oda showed kaido use acoc for ragnorak the chapter before.
Asura was just a tinge of acoc and it still scarred kaido
Arlong Park shows zoro ap affected by his condition
Hero usage... not villain....
No tinge, it was everything Zoro had, his haki wasn't affected.
Ap wasn't effected in subsequent arcs e.g. Mr 1, jet gattling , Hajrudin,
A couple (short) arcs before Arlong Park a mere stab wound from buggy nearly killed Zoro, they have become more superhuman as the story has progressed...