I didn’t read it all, but I think that tree diagram is pretty correct.
The more west you go, you start see “prairie Cajun” influences on everything. Traveling west on I10 once you come off the Basin bridge you’re officially in Cajun Country( Acadiana), basically Breaux Bridge to Lake Charles.
The food will taste different, it’s going to be heavier, spicier.
The Po boys are done differently ( bread and batter)
Seafood is boiled differently (spices and flavor)
Gumbo is different (roux)
I don’t have a preference for Cajun/ Creole. I like certain dishes prepared certain ways. I like the Cajun style crawfish etoufee, I like New Orleans style PoBoys.
I prefer my boiled crawfish
And my moms Gumbo. It’s the best I’ve tasted
Cracklin or Boudin is only worth buying in Cajun country. Don’t buy it in New Orleans.
The Best Stop in Duson, La hands down has the best boudin and cracklin IMO. If you find yourself on i10 west get off the interstate and go there
If you ever wanted to get a full appreciation for the difference come down here the weekend before Fat Tuesday spending time in places like Lafayette and st martivillle and then ending your trip in New Orleans. It’ll all make sense