from the comments,,,,,,,,,,,,,,,,
do not forget at least 8 witnesses stated that they heard the shot/s coming from the grassy knoll. ( In front of that fence. And the railway workers on the overpass with two cops as well as placing shots coming from the grassy knoll also stated they saw a "puff" of smoke coming down from the fence area at the top of the grassy knoll. Several of these eyewitness had military experience & one had been a (military) "Ranger " during WW2 & he said the direction of the sound the "shots" & the sound of bullets hitting " flesh & bone" was something that no combat service people will ever forget. Most of these witnesses were never called to testify at the Warren ( whitewash) Commission.