He didn't had a battle where he meant to defeat someone minimum strong enough to use CoC.
Against Zoro he didn't needed at all(although Zoro could possibly get KO by his CoC) and against Vista it wasn't meant to defeat him. In fact wasn't at Marineford Ace, Whitebeard, Luffy and Coby the only named characters who got defeated by pirate side? Oh Oars Jr of course.