Money must exist before it can be turned into capital.
Money could not be converted into capital if wage labour did not exist.
If all money capital invests in appropriation and none in actual production, than capitalism is not long for this world.
When money functions as measure of value it must truly represent the values it helps to circulate.
The geographical movement of money and commodities as capital is not the same as the movements of products and of precious metals. Capital is, after all, money used in a certain way, and is by no means identical with all money uses.