OP updated but still cross-referencing a few things - mostly out of the fact my memory on it is poor than that I have any suspicions. (The Claustrum timeline is interesting to consider though.)

Originally Posted by
HiraishinNoJutsu
Do we know the timeline for Louisoix Journey? As an Archon of Exegesis the study and interpretation of scripture surely a book didn't say "Bahamut is in Dalamud" so when did he find out? Surely you could kickstart the alliance getting together by telling all the city-state leaders "Remember those pesky Allagans? Well a huge fuck you dragon they are responsible is gonna break free soon"
Part of the magic of the end of 1.0 was that no one knew. Not even Nael van Darnus knew the true identity of Almighty Dalamud. The best hint we were given was that Dalamud was "an ancient sin cast to the skies."
Regarding the "Moon"
Not one of the four languages of this story specify. Not "the red moon". Not "the lesser moon". Not "Dalamud." That feels like it could possibly be deliberate.