The Orphans (spoilers)

[Skyblade]

I refer to the storyline based datalogs.Some of them keep changing based on Fal´cie information.Sometimes they even contradict previous information.We conclude therefore that either the recent information is false or the previous information is false but not both(since they are contradictory).
Conclusion:The Datalog lies at some point.

I admit I haven't finished the game yet, but, while a large number of the datalogs are updated, I have not seen any which list incorrect information at all.

(SPOILER)Datalogs talking about Vanille, for example, before you learn that she remembered her past life as a l'Cie, only say that she "seemed" to have forgotten everything. They do this often. They say that something appears a certain way, never that it actually does. So when it is updated, the original information is still true.

[Future Esthar]

The Datalog says for example that Disley is subordinated to Eden.
But near the end it says it gave orders to Eden.

[Draniei]

Why are these characters chosen and not others?
I don´t know but Versus will probably explain that.
[/spoiler]

FFXIII Versus won't explain anything in regards to FFXIII. Though they take place in the same world, neither has anything to do with eachother.

[Zora]

(SPOILER)I highly doubt that Orphan is NOT a fal'cie, HOWEVER, I do feel it's nevertheless important to point out that Berthandulus does infuse itself with Orphan. This means that enemy logs are null and void, since if Orphan wasn't a fal'cie, Barthendulus infusing himself with Orphan would have made Orphan a fal'cie by the time you fought him. Furthermore, his actual datalog does not actually state Orphan is a fal'cie beyond organizing him under fal'cie, and instead refers to him as a mysterious being. Still, I strongly doubt that Orphan is not a fal'cie.

Likewise though, while it is true that other Final Fantasy's have had orphans, being an orphan was not a motif in any game except XIII and perhaps VIII (Although, for VIII, it may have been shoddy writing). The idea of being an orphan, or at least being abandoned, comes up and up again both in history and dialogue. In other Final Fantasy's, it can be inferred through history and is rarely brought up in dialogue. However, I highly doubt there is any hidden plotline hidden in that motif, but I do believe the motif is part of the game's theme if anything.

[champagne supernova]

Orphan is most definitely a Fal'Cie. His purpose is to power Eden (but I'm not sure about the other Fal'Cie). Eden is the nexus between all the other Fal'Cie, making them interact with each other in a way that Cocoon worked. By killing Orphan, the Fal'Cie stopped operating in this manner, and Cocoon came crashing down in spectacular fashion.

The whole Fal'Cie thing on Cocoon reminded me of the Death Gate Cycle series of books. But the clear thing is that Orphan is a Fal'Cie created with the sole purpose of acting like a battery.