Before we completely indict the "Whiz Kids", let's get some details straight:

The Whiz Kids came to Ford Motor Company in the late 1946, straight out of the U.S. Army Air Forces Statistical Control unit. Despite the post-war economic boom, Ford Motor Company was a basket case. They were losing money hand over fist, and they were in danger of going bankrupt, or by a takeover from Henry J. Kaiser. Ford was a privately-owned corporation until the mid-1950's

They were hired by Henry Ford, II, and they're responsible for putting modern manufacturing systems and techniques into Ford Motor Company. Most famously there was Arjay Miller, J. Edward Lundy, "Tex" Thornton, and Robert McNamara. Even General Motors contributed to Ford's revival. They provided, intact, the Finance Manual used by Ford. It was copied with the only change being the logo change.

About half of them remained with Ford, and some left because of other career opportunities. Tex Thornton eventually ended up with Litton Industries, and Arjay Miller left to become the dean of the Stanford Business School.

To my knowledge, none of them left with Robert McNamara. The last remaining "Whiz Kid" was J. Edward Lundy, who was a confidant of Henry Ford, and was the Chief Financial Officer for years. He retired in the late 1970's.