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It's not Zoro stopping the Sea King's KE.If you want to use the calculated speed of an object (the Sea King) to calculate another feat in the same occasion (Zoro stopping the Sea King’s KE), you absolutely must calculate the speed in the same occasion. It is against our rules otherwise. So, yes using another Sea King’s speed is blatantly against our rules.
It's the Sea King's KE being used to find the Sea King's durability, and T-Bone sliced that Sea King in half which enables him to scale to its durability.
Though I am personally against it because I find it unreliable; the height of the Sea King's head / width is assumed, the Sea King is assumed to be 5,000 meters long, and the speed of the Sea King is found for a different Sea King and assumed to be applicable to this other Sea King.