What is the difference between 0% versus Disabled weighted remote sensor averaging?

Setting a weight to '0%':

This tells the primary thermostat to NOT use that temperature reading unless the other sensor(s) fail. If the other sensors fail, the primary thermostat will automatically switch to using the sensor set to 0% as its primary temperature reading and control the room to that sensor’s reading.

Setting the weight for the Primary thermostat to 'Disabled':

This tells the Master thermostat to NEVER use its internal temperature sensor even if the remote sensor’s temperature reading fails.