I love the theories guys! And some of these answers definitely cleared up some of my questions. Especially love the Tower being used to help create Cocoon, or one of the Pulse fal'Cie's attempts to ascend to "The Beyond" and reunite with Pulse. That could have been the Pulse fal'Cie's substitute for genocide on Cocoon to bring back their particular god.

Also the entry about Cocoon fal'Cie being Lindzei's creation and vice versa for Pulse, is definitely a help. HOWEVER, I'm not yet ready to completely abolish the idea that Barthandalus is Lindzei, but I see what you're saying Loony Bob with the Hitler analogy. It clearly says in the Datalog that Barthandalus created Cocoon for the reason of throwing the doors to the beyond open and summoning back the maker, and it also says that clearly Lindzei is the one who created Cocoon and it's fal'Cie. But, AHA...interesting theory:

Both Pulse and Lindzei dwelled on Pulse, then Lindzei left Pulse and created Cocoon, maybe then with the innocent intention of simply giving people a more sheltered and protected life than that of a life on Pulse (as it was clearly a savage existence). Lindzei creates Bart (ring leader of fal'Cie and their duties) and Orphan (created to keep Cocoon afloat and sustain it's energy), and, along with Hallowed Pulse, left their creations to thrive or whatever on their own. Bart's intentions are to destroy Orphan and sacrifice millions of lives - the sacrifice throwing open the doors to the beyond, and Orphan's death being a specific reason for Lindzei to return and see what the smurf happened to Cocoon...thus reuniting fal'Cie with (in Bart's and other Cocoon fal'Cie's case) their Maker.

I like that theory, but I'm still left wondering if Lindzei and Pulse were equals on a Godliness scale, or if Pulse was the supreme Maker and created other Gods like Lindzei and Etro. You could almost look at that in a Biblical sense (as much as I hesitate), like Pulse was supreme and created Lindzei and others in his image and from bits of his personality, and Lindzei (like Lucifer) wished to create his/her own kingdom away from the Maker's influence.

Or, you could even say that The Maker created both Pulse and Lindzei and Etro, and that's that. The fal'Cie are trying to bring back the Supreme God Commander lol
Sorry I know my entries are long as hell but I'm really interested in the Fabula Mythos! I think it's an awesome backdrop to the games if you choose to pay attention and figure it out. You know it's going to be explained much more in Versus and Agito, as Noctis and Stella are discussing the painting (which is of the Goddess Etro), and how they can see the light of the dead, or the light of the beyond. Which to me is ironic because beings like Bart are willing sacrifice millions of lives in order to glimpse the beyond and the Maker, and Noctis and Stella are like, "Yeah I've seen the light. Whatevs" Just kinda makes you wonder what kind of power in context of the Mythos those two have....KEEP THE THEORIES COMIN GUYS!

PS i am so down for a prequel taking place hundreds of years before the story, maybe following Vanille and Fang before they became chosen to be Ragnarok! and you can pretty much bet a sequel is happening, because Kitase and Toriyama said it depended on western sales...and its the fastest and one of the best selling entries over here in the west, despite the criticism. I love this game so I personally welcome it. give it about three years and for Versus an Agito to clear out and theyll announce for FNC titles. there's supposed to be 3-4 more judging by that graph in Famitsu...