In rapid fire, the only one that will work is the sight picture and gun control. Let me explain why.
When we're shooting in fractions of a second, we literally have no trigger control. I know some think we do, but we really don't. What control would you have in say 0.2 seconds? You don't have time to moderate the trigger, i.e. control the pressure, velocity, or acceleration of the trigger. How could the brain possibly sense any one of those and get the appropriate correction to the muscle group of the correct magnitude to correct or control anything? It can't; it's not humanly possible.
So in effect in rapid fire, again, i.e. fractions of a second, we are simply applying a force to the trigger - there is no control to it.