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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Eventually we give him Perfect Paradox. Assuming we go back in time and encounter a newbie Saint-14. Unless someone pulls a Warmind on us and completely rewrites Canon or pulls another ''folkyourlore'' on us again.