I really think they would already know if there was a fatty acid disorder and I'm not sure his symptoms correlate with that; no blood sugar issues, right? It's muscles, right? http://www.fodsupport.org/fods_defined.htm#symptoms
Those are the Very long chain fatty acid disorders, medium chain etc.
CPT is carnitine palmitoyltranserase I and II. Here's a blurb on CPTII. I'm thinking he doesn't match there either. http://ghr.nlm.nih.gov/condition=car...seiideficiency
If you look up CPT I you'll see a lot about liver. I know that they don't know a lot about CPT I and there are forms that they just don't have the research on or that's what I've been told. My understanding is there is much more they suspect and so it's still in the running with Andrew slightly, whose liver is fine. But it affects muscles. That's why I mentioned it.
What I would want to know is if Linden has any mitochondrial disorder markers. Have they mentioned looking at mitochondrial at all to you? That one seems to be possible given his issues but maybe they know something that I don't that makes them think otherwise.