Part 2:
5. Emet-selch's true name is Hades. ...
Actually that's backwards, Hades is his empowered by a god name. The name of his Element. While Emet-selch is his true name.

Reference FF12 for the names of each of them



You will see that the FF12 Espers and the Ascians have a lot of overlap. However there are only 11 ascians and Espers that share names and everything really. However a strong point can be made that Altima is probable a respelling of Ultima, and Elidibus the heart of Zodiark counts as Zodiark. Azem left the 14 and never was a part of the god summoning, so they do not have an Element/God granted power name.

6. lyrics from Endwalkers theme trailer
Are just that, they relate to the story, and it relates to all the characters.

7. I reckon that Emet-selch's hatred of heroes
More like a hatred of wasted effort, he actually respects the PC WOL.