Post by John McAdams
Bonus, O'Neill on the autopsy "missile."
Robert Cutler ended up with the Umbrella Man theory by a logical process.
He concluded there was a front of the throat entry. He couldn't map out a
shooter location from the knoll fence line that would not have been
interfered with either in tracking or in actual flightpath by the freeway
sign or spectators. So, eureka, the shot came from the Umbrella Man.
(For what it's worth I think he also considered the grassy knoll south
(the other knoll) but that flightpath didn't work either.)