For what it's worth awhile back I started
this thread to try to figure out how the heck having multiple point-defense gunners works (among other things). I did not get an answer. Based on
this thread from ten years back, Ulzgoroth, it sounds like you favor "a point defense gunner gets to see if his buddy hit before deciding whether to take a shot", is that correct?
You'd think that even if this question didn't have an official answer for point-defense, it would have an official answer for Sacrificial Parry or especially Shield Wall Training. But AFAICT we don't have anything official.