User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-6974847-20140710161114/@comment-4009941-20140710195344

The fact that when games come out and frontier updates it mentions the stort and info from new games like the fact that Brute Wyverns are not native to the Old World as far as people known and that it stated they were only encountered in the New World = 3rd gen games.

And with each update comes increase in timeline with main so the update with Inagami is obviously in 4th gen timeline. Eveytime a MH game updates or gets a new game the timeline moves forward by some years. Frontier mentions the New World multiple times but before MH3 it had nothing to mention because the guild was not doing anything in the New World then.