Okay so, in an adventure on Nessus, Failsafe is reminiscent and mourning one of her crew members. Your ghost sympathizes with her and states,
[quote] "Must have been hard to lose them. I don't know what I would do if...Never mind." [/quote]
It's pretty obvious that he's talking about our guardian permanently dying. But for a guardian to perma die, wouldn't their ghost have to be destroyed?
Most of the ghosts we see that are not destroyed and their guardian is dead are deactivated. So how would our ghost be able to do anything about your death?
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Didn't he revive us from basically skeletal remains at the start of D1? He had been looking for centuries. As far as dead ghosts intact I am sure there are ways to kill the light within while not destroying the ghost shell. The Hive extracted the light from living guardians after all.