First evidence of a general disease ("d") factor, a common factor of all illness

If its observed that at least some conditions are comorbid or often seen together (high blood pressure and heart disease, taking two examples from the abstract), would one not expect to see at least some correlation?

I expect its discussed in the paper but couldnt see it on the abstract (though ill grant even there maybe I didnt read hard enough)

Genetic predisposition is the very nightmare of the insurance industry, and if you think they won't look to mine 23andme or other sources, think again.

We will need legislated, regulated controls on this or we'll lose whatever social cohesive health cost model we have.