how is it not?
You are missing my point, I wasn't referring to Zoro ending a fight after launching 1 attack, I'm talking about if Zoro "lands" it has always been lights out for the opponent
Zoro clashed and used many named attacks on Kaku but the minute he connected 1 clean hit Kaku was done, same goes for Mr1, Ohm, Pica, Killer, etc
The point is we have seen Zoro and Luffy clash with people of similar levels and while Luffy needed multiple hits to win, Zoro can do it in 1, for me is solid proof that Zoro's AP is the strongest in the crew, heck just look at dragon blaze, its an attack Kaido and Big mom had to dodge, the attack travelled many kilometres and cut that gigantic horn off, there is nothing so far that Luffy has shown that can do the same.