Kaku has only used his Awakened Devil Fruit once in battle ... and even when eating, he maintains this form. Obviously, he doesn't struggle with the personality alteration that an awakened ...

Despite displaying Armament Haki and an Awakened Zoan form, however, Lucci and Kaku were no match for Luffy and Zoro, respectively. Lucci is now a CP0 elite agent with Haki and an Awakened Zoan ...

He also awakened his Zoan Devil Fruit in the Egghead arc. Lucci is more than willing to fight Luffy in his Gear 5 form, whereas Kaku preferred to run away. The strength difference is still night ...