I haven’t been able to locate it, but there was a recent study that showed an increase in plaques in some individuals but no difference in the incidence of heart attacks between those people and the ones without the plaques. Scientists get hooked on these markers, and sometimes they turn out to be a red herring.
I still say there is more that they don’t know, than what they do about diabetes.
What's a "heart attack"? A myocardial infarction, a congenital cardiomyopathy, inheredited arrythmias, sudden cardiac death, etc., without autopsies, it's just speculation. Getting an autopsy done isn't easy.