Starky's mission is to envade the Earth and kill the humans I think, and stop Lavos too I think.
Gaea's Navel is high above ground, it's so high that you need to fly a wingapeed. If you cant see, the land on the island is all above a towering cliff.
Also, Zeal was not around El Nido, and if the FF was in the Mammon Machine, then it would be around the Zenan continent. This kind of proves that the flame was found there anyway, that's how the central regime found it and gave it to Chronopolis in the Crono time line. Then there was the time crash, so 2 flames would exist anyway, one in Chonopolis, and one in Zenan continent that would be found in the future with Chronopolis so a new Chronopolis is made.
Also, It could be that Leah is Ayla's mother. Most likely because the Dinosaurs on the island are still primative, hence no evolution. Which might mean that it's a worm hole to 65,000,000BC prior, or that Leah is naming her child Ayla after Ayla (the great).