I find Igiss' imagination to be extremely lacking in this area. There are better possible explanations, yet he simply chose to trample vanilla lore with his own convoluted ideas.
Alternate possibility: Gallia discovered its own DK library and developed its own G/L network independently but in parallel.
That still wouldn't explain docking rings, though; those are 100% Ageira designed and developed.
Edit: for some reason the Wiki's Valhalla One article has docking rings as one of its technological derivatives. I don't believe this accurate, however.
Edit 2: after checking, I am correct. However, Docking Ring tech was licensed out to other houses, so it's not nearly as secret - explaining how even outcasts and corsairs could steal it. Still very expensive, though.
