legally with 5 GPD online at the time the Reserve Hit has commenced, the entire operation should(in my personal opinion) be allowed to be completed even if the number of GPD online drops below 5.
I've noticed that the script is set to not allow the safe to be opened unless there's exactly 5 on thus if a group of us were to go after it there is some grey area there as I've seen an attempt fail because the 5th GPD disconnected just before the safe was opened...
I'm not saying the GPDs gamed the system to not allow the safe to be opened as any number of things could have happened (computer crash, real life, etc...) but it would be frustrating to put in that kind of game time into it and be rewarded with nothing.
Is that something that can be scripted? Perhaps tie it to the first door being broken in to.
EDIT: I wasn't sure if this should go under rules discussion but I figured this could be a feature I chose to place it here.