Well sure, that was how Gaara won. But at that point in the battle he had other ways he could win. The only issue here is Joki Boy since that was what was preventing the Mizukage from getting sealed, but after exploding once Gaara can quickly seal Gengetsu before JB explodes again, or seperate the two of them and airlift Gengetsu into the sky where JB can't reach him. I explained my opinion better in this threadWasn't that because of the density of the gold sand counter acting the oil? If Gaara doesn't have that, I don't see how he wins. But if he does, sure.
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