When you first started off Destiny, the first mission started you off as you being revived by "ghost". This is where it gets interesting. If we were already dead, how can we be revived and still be as athletic as a cheetah? Wouldn't our bodies need time to re-adapt and regrow? Also, when we finally end up fighting our way in to the ship hanger, a Fallen Archon Priest greets us as ghost tries to start up the abandoned ship and ghost just "magically" transports us into the ship? Are Guardians nothing more but 3rd or 4th dimensional beings being projected on a more technical level(Projections)? The whole guardians being zombies without loose ends fits them right.
Should Guardians be labeled as zombies?
[spoiler]Destiny 2 better not dissapoint. Checkmate.[/spoiler]
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The ghosts are part of the traveler, the traveler has powers beyond our understanding and we're not brought back without purpose, we were chosen to save the traveler and humanity.