Primals, and their nature?

[Nalien]

You know what I don't get about Odin? If the person who defeated him claims his sword and thus gets tempered... Well firstly, we cannot be tempered due to the Echo, so how's that even happening? Secondly... If the person who defeats him somehow gets tempered and "becomes" Odin... How can that same person fight Odin during the FATE when they should be Odin?

Primal : Midgardsormr
First Encountered:
Trial: N/A / Keeper of the Lake (but it's not a trial, nor is he truly defeated . . . )
process of summoning: Louisoiz Leveilleur had citizens accross Eorzea praying for a solution to the war with Garlemald, and he channelled their prayers into summoning the most powerful Primal of all time, Midgardsormr, after the battle Midgardsormr collapsed and fell down in the lands of Mor Dhona, wrapped around the Garlean vessel ______.

Midgardsormr isn't a Primal, and that never happened. You seem to be mixing up 1.0s intro with 2.0s; Lou wasn't around during the Battle of Silvertear Skies, nobody prayed for a solution to Garlemalds advance (except the Beast Tribes). 2.0s intro had Lou and the Circle of Knowing praying to the Twelve for a solution to Dalamud crashing into them. Midgardsormr just saw Garlemald flying over his lake and decided to kick their butt. I strongly suspect this was also due to the Garleans attempting to recreate Crystal Tower around the same time with Bozja Citadel; They attempt to recreate it to call down Dalamud then head to the original Towers resting place? Yeah...