I used a multi-meter and found that the Z pin has connectivity to all the in.out pins (Y0-Y7).
When you use a meter to measure connectivity the meter has a power supply that gives a voltage on the outputs of the meter. As this voltage is not referenced to anything (it is floating) you can't use the meter to see if there is a path through a powered circuit. As has been pointed out you can't use an un powered circuit either. So in this case your multimeter should not be used for this type of measurement.