A320 Gnd Ctl

[Flyman35]

After you do the cockpit preparation and disconnect external power the blue light of the GND CTL push button will turn off I understand that I don’t have to push it again as it is already in automatic mode due to electrical transient as stated in (indicating-recording systems) 1.31.60 page 2 but I was advised by the safety pilot to push it again to get the blue light and we enter a debate any ideas..