[quote=@Kho]
I seem to remember Gerrick being around before TOBIA went on her 4,000 year hike...
[/quote]

Gerrik was also around when Shammick and the like received the vision from Teknall, which was before Gerrik invented fire. He wasn't a hero at that stage.

[quote=@Cyclone]
And since Vetros was artificially advanced by Ventus and so on, it can reasonably exist as such and not make the timeline with Gerrik seem invalid. Maybe Gerrik just invented fire for he Hain whereas it was already widespread in Vetros and Alefpria.
[/quote]

This is the case. Gerrik only invented fire for the hain, who were still in tribal structures across the world. Humans had figured out fire back on Arcon, before they had been shipped to Galbar.

Although, that gives me a side-thought. If humans had fire first, then it is quite probable that some hain villages near human villages may have also picked up on the technology, meaning Gerrik wouldn't have been the only source of its spread, just the most prolific source.

I agree, though. The Gerrik timeline is somewhat at odds with many other events.