It would explain why it didn't fit into any of the traditional methods of code we'd been using. I did speculate earlier they could be using a new cipher or code system, and that fits into that. So, it's a possibility we have our new basis for the codes.
But what do we do with it?
EDIT: I've found a website that you can enter things in Navajo code and it will spurt it out into any means imaginable (E.G Morse code, caesar cipher, binary) I'd hazard a guess the guys behind the ARG have been using a similar tool.
You have to input the Navajo code in all capitals for it to function.
http://cryptii.com/navajo/select
The fact that a website even exists that allows for Navajo to be used alongside binary and morse and caesar cipher would say to me that (with a bit of hesitation) we've found our next code system.