@UnapologeticallyAspie (love this name! Marie Curie was an Aspiegirl).
First, I hope that you and your husband are doing well. ))
Second, I like that you mentioned connective tissue disorder... intuitively, I always felt something...
When I first saw the video of the BG, before it was cleared and processed, and read the comments about bulbous nose, two things came to my mind. One, rosacea, and two, malar rash.
Very different skin changes, and for different reasons. With rosacea in his age, one would think, heavy drinking. Malar rash implies a spectrum of connective tissue disorders (not that they are rare, they are interconnected, at times, the diagnosis is approximate).
And at first I thought, surely, alcoholic, look at him, and then I remembered how healthy people would look between, say, lupus attacks. In short, to me a flare-up of an autoimmune condition, or even, steroids used for treatment, could explain how a seemingly normal person might get very ill (and mentally, too). So ill that he'll do the unthinkable.
So while I understand the futility of diagnosing an apparition on a decrepit bridge, hey, people saw a dog in his jacket )))
In short, I always intuitively felt it. Not connective tissue, autoimmune disorder. Do you think he might have something autoimmune, or rather, genetic, like collagen disorder?