When you say KO artist how high of a KO ratio are you talking about?
Or can you define KO artist a bit more in your perspective.

I ask because I would consider Canizales a KO artist...

To me a KO artist is a boxer with like a 60% and higher ratio. But there are exceptions. There's a handfull of KO artist who I'm certain have more of a 50% ratio and yet they fall into this category.

Patterson vs. Chuvalo
Fraizer vs. Bonavena
Cintron vs. Angulo
Zab vs. Matthysse