I imagine he'll be a boss somewhere down this quest line, it'd be a waste if he wasn't (even in in FF6, the Atma Weapon was just a mistranslated Ultima Weapon).
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I think they should have each of the 12 Atmas all drop off of Titan EX mode, but you have to elect to have a negative echo buff of 25% applied to you to increase the drop rate from -50% (That's right, there is a 50% chance that beating the boss will take AWAY an Atma from you) to .05%
Each of the 12 have the same drop rate and you can and will get duplicates. Once you get all 12 they are destroyed and a man dressed as a Chocobo comes to your house and runs around yelling and pouring a soy-sauce peanut-butter hybrid all over your furniture (or bare concrete floor, lololz). ONCE THAT'S DONE you have to level a new Conjurer class to level 50, but the only spell they get is Stone and it costs all of your mana every time you cast it. After that, the game automatically uninstalls from your computer and all your data is wiped, including things not FFXIV-related, ESPECIALLY pictures of friends and family. Don't worry, all of your porn will stay on your computer.
When ALL OF THAT is done, then, and only then, are you allowed to die.
To be sure, it's quite time consuming, but I'm pretty much okay with it. Good luck with your revolution though! I'll just be over here eating my cake.
Would have taken this seriously if it wasn't April 1st.