Wasn't the point of the original Routers article that GS owned the storage warehouses and therefore could (and did) control the speed/amount of aluminium being shipped out, against the wishes of those who owned the metal. i.e. GS have huge control over the supply of a finite resource. Saying 'well the price did fall' doesn't undermine the argument that GS were controlling the supply to their own benefit since we don't know what positions GS took on aluminium over that time.