The whole premise of the Lone Nut only case is this...
That 3 shots were fired. The first shot went through his upper back throat and didn't exit came out of this throat and went on to hit Connally.
The second shot just missed wildly, kicking up concrete way down by the underpass and nicking a bystander.
The third hit him in the head throwing his head forcefully toward the rear defying the laws of physics.
That, in and of itself, is a great starting point to argue against the official theoretical conclusions in a court of law by a team of lawyers for the dead defendant.