I honestly don’t see anything in those links that proves higher powers invented resurrection... the claims that two marauders learn how to resurrect could easily be exaggeration and legend, and again doesn’t explain how/where it came from. The current explanation of the source of marauder tp/spawn is their work with karavan defectors on the remains of the rainbow bridges. So their system may actually be an tryton based teleportation, while Kara and kami could very well be killing your original body when you tp and redirecting your data through the roots of atys to a natural or artificial spawn site. Again that was my hypothesis based on the fact that everything on atys respawns.
I didn't stated high powers invented (Jena, Maduk, <insert>) the resurrection.
It is most probably a technology from the earth itself (from Atys pre-terraformation era).
As for Marauder teleportation system, a dissident branch of the Karavan (Hominist side) provide it.
PlacioI like this idea, it remind me of the greek myth Gaïa or the version commonly modernized in FFVII (and movies) :)
.. redirecting your data through the roots of atys to a natural or artificial spawn site.