> It's surprising how the disease crept up on him despite the annual checks.
Depending on the cancer, they can act extremely fast. My father died from a pancreatic cancer, he got about three months after the discovery, and before that he spent under a month with severe back pains (doctors were telling him it was nothing but he forced them to get to the end of it and find out why he was in so much pain).
Considering Mr Martin's myeloma took out a whole vertebra before he hurt enough to go see the doc, I'd say the thing was particularly ferocious, and short of checking every 1-3 months he would only have caught it by luck.
> Does executive-level healthcare exist or is it just in my imagination?
it probably exists, but you have to factor in the long hours and activity which result in both physical stress and not much time to go see the doc', short of having your own on retainer.