That's an original way of looking at the top cause of death! We're used to it being heart disease, but you're saying the ultimate cause of death behind heart disease and other stuff could be attributed to scarring. I would say maybe it's aging? Overscarring doesn't seem to be present in very young people? And most diseases seem to happen after a certain age.
RE: Building a disease model to understand the most common reason for death - an overscarring wound. Part 1 - Introduction (Original Research)