I am with you about the rear skull head wound, McLelland's account, nurse Bell's account,...seems very convincing. However, the CTers will waltz along with all their counter-arguments and the Zapruder film shows a shot from the rear and a frontal explosion. It's a conundrum.
I believe this reliance on the Zapruder Film is because/why the Original NIX FILM has been MIA for decades. They did miss at least 1 thing on the Nix Film Copy we do have. The 3 Frames that show a White Shirt Man running Up-the-steps. None of the 3 Men standing at the bottom of The Steps was wearing a WHITE SHIRT. Yet, we have 3 Frames of a White Shirt Man on the NIX Film, and we have the Lee Bowers WC Testimony of his seeing a WHITE SHIRT Man standing (S) of the E-W section of the picket fence. Bowers WC Testimony corroborates the NIX FILM White Shirt Man.