Funny enough, yes I am. My committee chair wrote about her work, though in a different context.
While Chael Sonnen can be pretty much summarily dismissed, there was some interest in/talk about the idea that Cooper might have been native. There is a large amount of reservation land up not far from the LZ, and it is one community within which there might not have been any interest at all in cooperating with law enforcement. It would certainly reconcile Cooper's "silence" with the law-enforcement gospel truth that sooner or later everyone talks, or is talked about, in a way that doesn't require him to have died in the effort.