Some of what you say is a misconception is really just an alternative interpretation to your own. The AoE markers for example, - While the game doesn't actually say it's WoL's Echo allowing them to read telegraphs, the fact that we know it's possible and the fact that WoL is so powerful and can clearly see indicators that couldn't be reasonably read just through inference makes it a tidy explanation. The "WoL can read how battles happen" idea? There is actually evidence for this in the game with the various Minstrel ballads, which Omega explicitly says should allow WoL to tap into their own psyche and play out various confrontations in order to grow stronger from the experience.

As to the question of WoL soloing for most of their adventure, frankly it should be clear that outside of the two particular cases where this was narratively important, the existence of anyone helping WoL is highly questionable at best. Your breakdown is pretty comprehensive, and seems to show quite cleanly that there was a shift in writing from ARR onwards that was only partially broken through some tongue-in-cheek descriptions in Stormblood. As such I'm not so sure why you listed the answer to that section as being "NO", despite the answer in the vast majority of cases being "yes".