My own head canon is that the ghosts are a quantum footprint of the person you were. There is a paradox in quantum theory that on the quantum level any quantum index of information can be deleted or destroyed. Some might call this the soul. I thick that for a lot of the first ghosts, the traveler bound the index of those dying in the collapse to mechanical artifice. Some found their body quickly, and resurrected them as the first guardians. Others had to look far longer. Many gave up, and picked a lesser body to revive, others hunt even now. And some chose the Hive. I've always chosen to believe that I was revived from a body that died in the collapse, on that haunted desolate highway of cars left to decay, bodies of those trying desperately to reach safety. I like to imagine at the last I was trying to help others to safety. That i knew the risk, and chose to take it. And that in this act, I was chosen. There is some backing to this. Crow, Uldren, sacrificed all for his sister, doing what he believed was right. And that sacrifice lead to his death. Savathun in turn died, she was devoted to protecting the traveler, and while her reasons were selfish, her goal was to protect her people, and the light. It doesn't have to be devotion to the traveler that makes you worthy. It is devotion to something that is so important it is worth sacrificing for. Worth dying for. We call them our ghosts because our ghosts they are. Anyway just my head canon.

But they aren't. Exos memories are fragmented because of all the resets they go through. The only reason the exos are functional is due to clarity control without it we've seen what happens in multiple lore tabs. They go insane and kill themselves.

Ghosts are made from fragments of the Travelers consciousness. Exo memories aren’t messed up, everyone gets wiped. The dreams they have existed when they were still regular Exos. It’s hard to say the exact cause. Because Clovis used Darkness energy and radaloria to make them.

Ghosts suppress all Guardians memories, Human,Exo and Awoken when being chosen , to prevent there past from interfering with there duty to protect the Traveler My question is, why are there Exo Guardians in the first place, if Ghosts can resurrect hundred year old bones and flesh, why doesn't it just rez them has there human version?