-Forged a black blade over course of many duels
- almost single handedly protected the country from wg threat and pirates alike
- developed different styles that would later be adapted by other swordsmen in the country
- worshipped as a deity and triggered the fearsome samurai reputation that last for years
- Conquered the sea becoming the pirate king
- on par with the strongest person on the sea i.e the strongest person on the sea
- Had strong/capable subordinates ,the likes of odenand rayleigh.
you can clearly see why so much is invested in that zkk theory
getting hard to see what kind of legend zoro can build to surpass these two. perhaps mihawk was and truly is the goal.