The Rathalos go missing because...
They all ended up in the world of Dragalia Lost as seen in the crossover event Dragalia Lost Primal Crisis.- Jossed.
Oltura will be added into the main Monster Hunter games
http://tvtropes.org/pmwiki/pmwiki.php/WMG/MonsterHunterStories2WingsOfRuin
FollowingWMG / Monster Hunter Stories 2: Wings of Ruin
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