Guardians - Immortal?

I believe that since light is eternal, the guardians are eternal. See, the guardians were given a light. A light cannot be smited by Darkness, it can only cover it. Even when covered, we live. This explains how we can be revived by our ghosts. We contain light. Now, certain types of enemies can [i]eat[/i] light. I dont believe they are dead after their light is eaten. I believe they are simply [b]hidden[/b]. Contained inside of the belly of the beast, they are blotted out by the Darkness. But they live on in torment. How else could the ghost track the sword of crota by the amount of guardians its "killed". Thats because they are simply "disabled". Put out of commision, but not dead. So, still traceable. So if nothing puts out a light, what happens to the light? In this case. I domt have an answer. In all our years living, none of us have experienced light being unattainable. Light js always present through some means. And energy isn't eliminated, it is transformed. So, assuming we are literally the culmimation of pure light energy, as long as we aren't transformed into something else, we cannot die. We are endless. And thats the power of the traveler. To pour its light into a vessel. Those vessels are the ghosts. And the ghosts can each pour some of their light into a guardian. And that is why they coexist together. They are bound by the parent energy source. This explains why eris morn comes off so damned purturbed. She is without her second half. Half of her is gone. Half of her is a hidden light. The other half, is the light that her late ghost gave her.