This idea might be a bit blunt and straightforward, but it's better than nothing. Saint-14 had his light drained out, right? Well, why don't we just take his corpse and toss it into the rift full of his light?
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Perhaps, in certain circumstances a guardian could be resurrected given they have light left. But in saints situation his has been drained, but there are ways still the Traveler is awake and that can be another way. Perhaps a different timeline in which he still has light left, but then again it’s a Perfect Paradox.