Samurai and Ala Migho

[Shippuu]

I just have to ask... how is Samurai a fitting a choice for Ala Mhigo?

Who says Samurai has to be from Ala Mhigo? And the Ishgard jobs fit well enough because SE made them so. Before heavensward Machinists would have made zero sense coming from Ishgard. To use your example of "old English hyur putting on lamellar and whipping out katanas" how did "old English knightly and religious medieval elezen putting on gadgets and whipping out guns and robots" make sense? It only made sense because SE wrote them into the story in a believable way. On top of that one of the main characters for that job story to teach machinists how to shoot was a 1.0 character from Limsa lominsa.

Astrologian's are also Sharlayans and their job story had very little to do with Ishgard and everything to do with Sharlayans and their politics.

Dark Knight is the only one that has some semblance of fitting into Ishgard's society naturally and even that was severely underplayed to the point it could have been from anywhere.

Even with all that said, it's also unlikely we will even start in Ala Mhigo at the beginning of 4.0 and will more likely be fighting our way to reclaiming it during the 4.0 story which means any new jobs wouldn't be tied to the city state anyways. As such there's plenty of room to write in a displaced Samurai trainer from Doma who teaches our adventurers his ways to fight back against the same empire that took his home. While their home is gone, the assistance in helping another group of people who suffered under the same enemy is a noble one and a likely story thread.