Don’t know what BS doc you were watching, but the Grassy Knoll was on JFK’s side of the frigging car.
The documentary aired on PBS a few years ago.....probably during the 50th anniversary.
All I remember them saying was a round from the grassy knoll would have killed Jackie Kennedy as well. Would the round have hit JFK first, and then hit the first lady? With the grassy knoll on JFK’s side of the limo, like you mentioned, it would have been impossible for Jackie to have been hit first. Who knows. Another “film maker” with another theory.
That was “their” conclusion. It doesn’t mean it’s the God honest truth of what happened.