I think your pretty right tim, the neurons would need to send a whole different message from triggering to actually moving towards the ball, hence why if you trigger to late you have no time to move as it cant fire 2 at a time!
I think it just gets you ready to move and shortens the movement that will be needed, as you trigger into a better position...nobody triggers out of position as then more work is required...
morgans is just about getting himself into a better position to play the ball meaning he can react quicker than if he was in a bad position...
surely thats all triggers are about?
no?