regardless of block type, don't 'duplicate' any attributes or you'll get yourself in trouble down the road.
another thing, even if you don't plan on moving the attributes around with actions, you have to check the 'lock attributes' field for visibility states too.
edit: if any actions are to be imposed on attributes, then those attributes must be 'locked', or they won't behave as desired, i.e.: turning on & off between visibility states, or moving, etc.