Also see that book if you'd just like an entertaining, well-written read. That book (and the two Eugenics War books) are still the only works of Star Trek fiction that I liked enough to buy in hardcover.
Wow. Thanks to you and Christopher for the free plug and rave review.
And, yeah, Khan only says how many of his people were killed BY THE EELS. It seemed reasonable to assume that others were killed other ways, especially after the cataclysm. Earthquakes, disease, violence, etc.
As to the generational issue . . . let's be honest, there's a bit of confusion here. The
dialogue in WoK certainly implies that Khan's henchmen are the same ones from "Space Seed," but the casting director clearly didn't get that memo! Joaquin and the others are obviously much younger (and blonder) than the original crew of the Botany Bay. So that's how I wrote them.
Incidentally, I spoke with Judson Scott about this once, and, as far as he's concerned, Joaquin was supposed to be Khan's son. (That's not the official party line, though, so I split the difference by making him Khan's
adopted son.)