LP--
Interesting question.
I think both SBT'ers-LNT'ers and CT'ers got off the track by either formulating that there was a large conspiracy, or then refuting the obvious flaws in large CT's.
A small, informal or ad hoc conspiracy, of low level Alpha 66'ers or G-2'ers, which left no written evidence behind, and which was only tangentially connected to any institution is my preferred CT narrative.
Detecting such a conspiracy would be difficult, say if LHO was dead ad the other two perps kept quiet. Then what? Who knows anything?
The WC had an inclination from the start to go LNT; we know that from LBJ's instructions to Russell and Warren.
(I can't get past Gov. JBC holding his Stetson at Z-272, or his body being thrust forward at ~Z-295.
Connally: I was knocked over, just doubled over by the force of the bullet. It went in my back and came out my chest about 2 inches below and the left of my right nipple. The force of the bullet drove my body over almost double and when I looked, immediately I could see I was just drenched with blood. (1 HSCA 42)
The evidence (there is that hallowed word!) seen in the Z-film is indisputable; Connally is pushed forward ~Z-295.
I doubt JBC could hold onto to his Stetson hat after being shot through the wrist by a large "tumbling" slug.
Yet, JFK is indisputably shot at Z-313.
The GK smoke-and-bag show indicates another perp as well.)
The Mafia? Possibly, but there seems to be oodles of connections between LHO and intel agencies, and very little linking him to the Mob.
Caveat emptor and draw your own conclusions.