I find this like the question of the ultimate spear vs the ultimate shield the only reason Kakashi got through domu is b/c lightning beats earth. Can Sakura punch Kakuzu hard enough to damage him. Obviously the force of the puch would send him flying, but would it actually hurt him. We never saw the limits of it's durability. I know a lot of people don't like the databook, but it's the only info we have on the technique.
The user flows chakra through all parts of their body, causing it to become noticeably darker, which increases their defensive power to its utmost limits by making the skin as hard as diamond, easily capable of withstanding most attacks with little to no damage. As a result the amount of techniques that can break through the areas hardened by the Earth Spear are close to zero, excluding its undeniable weak point: Lightning Release ninjutsu. Furthermore, the destructive power of physical attacks is increased, making this a great all-purpose technique. Kakuzu used this technique through the use of his earth-element mask.
The user flows chakra through all parts of their body, causing it to become noticeably darker, which increases their defensive power to its utmost limits by making the skin as hard as diamond, easily capable of withstanding most attacks with little to no damage. As a result the amount of techniques that can break through the areas hardened by the Earth Spear are close to zero, excluding its undeniable weak point: Lightning Release ninjutsu. Furthermore, the destructive power of physical attacks is increased, making this a great all-purpose technique. Kakuzu used this technique through the use of his earth-element mask.
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