Re: What happened to the rest of Vengeance's Section 31 crew?
Part of Khan's work with Section 31 was to come up with technology that protected the warp core.
As for the rest of Vengeance' crew, two words:
Now that I've seen it, and have also had time to mellow, to really think about it, I now find it absolutely, unbearably repulsive in every way except for some of the acting. - about The Wrath of Khan. Interstat, Issue 62: 1982