Okay so here’s a scenario
Ghaul: *entraps the Light*
Guardian: *gets killed*
Ghost: *does survive but can’t bring them back*
*few weeks pass*
Ghaul: *gets defeated*
Ghost: *gets the Light back*
Could that Ghost go back and revive their Guardian?
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Yes. The only ways to permanently kill a Guardian is to destroy their Ghost, and then kill them…. …or cut both of them off from the Light and then destroy them both. Generally only the Hive and other minions of Darkness are powerful enough to do that. But if the Ghost survived the war, it could go back and revive their Guardian. The other issue is that the Traveler healed itself at the end of the War, so She is capable of creating new Ghosts, and therefore more Guardians.