What's worse is, given a hypothetical scenario here, he probably wouldn't notice the symptoms of the hit to the head if LC symptoms are severe enough. Permanent headaches are common, basically all the symptoms of a concussion are common with LC, and ME, there's no way for someone who's living with those for even just a few days to tell the difference. When you're used to feeling like death, dying feels like nothing unusual.
Hence making the algorithm of "common symptoms of illness = no disease" especially self-defeating. It's like symptoms don't count unless they're unique snowflakes. So weird.