Vice Admiral Kuzan at the age of 25 appeared to have been responsible for the deployment of CP9 in pursuit of the "criminal" archaeologists of Ohara.

He was one of the five Vice-Admirals taking part in the Buster Call on Ohara. During the attack, the destruction of the civilian fleet, ordered by Vice Admiral Sakazuki, came as a complete shock to Kuzan. The original order that had been sent was for all those who had not been involved with the Ohara scholars and the Poneglyph, to be safely transported off the island. However, Sakazuki's course of action was the complete opposite.

Kuzan then froze Jaguar D. Saul using his Devil Fruit powers. He helped Robin to escape via the use of his Devil Fruit powers, by freezing a trail in the ocean for her boat to sail safely through. Before her departure, he warned her that he is not her ally despite this one assistance, and would be quick to come after her, if he ever felt that she was a threat

He was about to turn away, but his eye caught someone. A survivor? The explosion of the ship caused them to got the island ground. Kuzan rushed over to their aid. If he couldn't save the others then he'd save this one person.