Now that the dust has settled a bit, I want to thank Tom, Jeff and Matt for clarifying the outer wall/lateral force question for me. I now understand that the Neapolitans use an outer wall material that is neither purely an insulator nor is purely structural, but that provides aspects of both.
That being said, I'm puzzled as to why the Neapolitans would put so much additional labor and materials into their supposedly energy efficient/wood saving vent, and yet allow so much precious energy to be lost through the walls. If this quasi insulation is, indeed authentic, then, imo, authenticity be damned.
I know that we've gone back and forth conjecturing on the potential merits of the Neapolitan vent a few times, but this is a non starter. Let structural elements perform their roles and insulating elements perform theirs.