Currently working hard to get the annotated Tales finished before the next one comes out, but popping in to say that I did manage to read the translations of the other languages. Indeed, English is unique in Louisoix saying "If I don't return" rather than "I will not be returning." The English version conveys Louisoix's gentle personality, actually leaving out his admission and simply saying he told Minfilia "the rest." The German translation articulates the concise Japanese most clearly without omitting the blunt truth.
Code:
Das Ritual ähnelte einer Primae-Beschwörung und barg die Gefahr, alle Bewohner Eorzeas in von den Zwölf Besessene zu verwandeln.
The ritual resembled a primal summong and had the potential to turn every resident of Eorzea into Twelve's tempered servants.
Er würde die Kraft der Götter kanalisieren müssen, ohne ihnen Gelegenheit zu geben, sich körperlich zu manifestieren.
He would have to channel the power of the gods, but without giving them the opportunity to manifest physically.
Dazu gab es nur einen Weg: die Eliminierung des Mediums, kurz bevor dies geschah.
There was only one way: the elimination of the medium, just before this happened.
We've known for a while that Louisoix's plan failed because the Twelve's strength alone was not enough to overcome Bahamut's power, but we didn't know that even if Dalamud was a simply moon, even if Bahamut did not appear, even if the Twelve's power were enough to raise Dalamud, Louisoix still intended to die. The plan was that, after the Twelve's power was invoked, but before they could physically manifest, he would take his own life to interrupt the ritual. He never got far enough into the summoning for us to see that part, however, because Bahamut interrupted the ritual well beforehand and he decided to fall back on something else...
Makes you wonder, though... when he sends the Warriors of Light away, you see the same type of circular glyph that appears around the wrists of summoners around his own, and within it is the symbol of Althyk. Were Bahamut's disappearance and all this memory loss a result of Althyk's power, as well? Was this invocation interrupted, or did Althyk manifest somewhere? Or is it all related to something else?