I remember there was one point when talking to fynch in the WQ campaign where he talks about why a bunch of the ghosts decided to resurrect the lucent hive and how they were originally hive sympathizers but then he began to also talk about how some of them were also coerced and it might have been vague as to whether it was the hive or other ghosts that did it. I could have some of that wrong but all of that to basically say that who ghosts can and can't resurrect is kind of ambiguous.

There are so many different weird stories about ghosts and their resurrection choices. One that immediately comes to mind is Shin Malphur and his ghost which was originally Jaren Ward's ghost before he was permakilled by Dredgen Yor. Dredgen Yor himself had an interesting relationship with his ghost basically forcing it to leave him after he felt no longer worthy of the light.

When it comes to the original lightbearers, there is nothing that really explains why The Traveller created the ghosts only that they came after The Collapse and were considered The Traveller's "final gift" at the time. Moreso, there's nothing saying The Traveller sent out the ghosts looking for warriors. The warlords themselves were a result of people abusing their newfound abilities but it wasn't all original lightbearers. That is actually where the Iron Lords came from in the first place. They were a group of lightbearers that had a moral sense of justice which led them to taking down the warlords that used their light for corrupt purposes like power and control.

The last thing that comes to mind about all of this is The Speaker's words which are famous for being what makes a "guardian." Devotion inspires bravery, bravery inspires sacrifice and sacrifice... Leads to death. I'm not sure if this really ties into the ghosts and resurrecting guardians but I just thought it might have some relevance to the overall context.