Yes, that is my conclusion seeing the above picture : This USB connector is directly in parallel with the header pins connected to the converter, allowing people to use the board on other SBC using male-male cable like in the picture. I don't have such cable, so I can't verify that ... That means this connector should always left empty while the board been used with OPiZero, meaning only one USB is available.   If we can get schematic on day, that will prove all this con