What if he's forced out of the industry...

What rules? Are they stated? Is there any document? Don't tell me there aren't any documents; even if there were, wouldn't tearing them up eliminate them?

"Hahaha..."

Mihawk stared at Kuro for a long time, then suddenly looked up and burst into hearty laughter: "Hahahaha!"

His arm relaxed, and the brilliance of the black blade 'Night' gradually faded. His smile carried a hint of joy and boundless satisfaction.

After laughing, Mihawk said to Kuro, "Regardless, you did win. I was simply outmatched. In this contest of skill, I lost."

That's absolutely true.

If they fight with their true strength to determine a winner, it will be earth-shattering. If they don't fight well, it will be like the scene between Sakazuki and Kuzan back then, where the injuries were hard to recover from. If they don't fight well, Kuro might have to take down Sakura and Kokuro to use as legs.

What's the point of winning if you do that? That kind of 'world's greatest swordsman' won't be able to sit still and will be defeated very quickly.

There is no such thing as 'invincible' in this world. Whitebeard is known as the 'strongest man in the world,' but Kaido is known as the 'strongest creature in the world.' Strictly speaking, they are both 'invincible in one-on-one combat.' However, if Kaido were to actually fight an Admiral one-on-one, his 'invincibility' would be broken, and he would definitely be seriously injured, allowing someone else to take advantage of him.

To determine which is better, one can only scratch the surface.

With both sides holding their own, Kuro was clearly superior to Mihawk.

so...

"The title of the world's greatest swordsman is yours, Lucilfer Kuro!"

Mihawk shouted, "You are the strongest swordsman!"