User blog comment:Kogath/Monster Hunter: World Discussion/@comment-31029678-20190208002724/@comment-4370375-20190209194605

The fact that this collab acknowledges the FF one is why I'm inclined to believe that these are going to be canon.

Keep in mind that while the Commission anwsers to the Hunter's Guild, we are largely isolated for the old world so the longterm effects of the events in World on the MH world as a whole isn't 100% clear yet.

Assumiing these are canon would give the ideal buffer for collab monsters in all future games as the Guild can just say "Just so you are aware, we've had reports of monsters from other worlds entering ours so be aware that you may have to fight such a monster yourself".

It's kind of like how while the Monster Nest mechanic of Stories is incompatible with the ecology of certain monsters, the actual story and characters as well as the very concept of a Rider itself are compatable with MH lore and would only need some workshopping to make it work in the mainline continuity.

Hell, Pukei-Pukei helping Geralt seems like how a Rider mechanic could work in a non-Stories Monster Hunter game. Just make the the Pukei ridable and have its health work like the Palicoe's and boom, Monstie.