Irlandes,
The lead angle is a natural thing, governed by the physics of how the blade flaps, and we rig the controls to make the pilot's job easier by assuring that the nose follows the cyclic (within a few degrees). The lead angle (we call it gamma) is driven by the flapping phase of the rotor to the cyclic pitch input, a fast acting blade needs less lead angle than a slow acting one. A blade has to respond to the aerodynamic change we make (the mechanical angle change is very fast). The response time for the blade to rise is a factor of the flapping inertia (weight, hinge location, location of the blade's CG, rotor rpm) and the forces that damp its rise (aerodynamic resistance, mechanical damping). If the blade is heavy and wide, it will take a long time to rise, if it is light and thin, it will jump up more quickly.
We can also mess up the swashplate part of the rigging angle if we change the angle that the blade flaps through, for example if we place the pitch change rod ahead or behind the flap hinge so that the blade flaps up and either moves forward or backward relative to the rotation. This changes the need for mechanical gamma by exactly the angle of the pitch rod to the flap bearing (we call that angle delta-3). This correction confuses some folks and makes for very long posts.
Suffice it to say, the gamma we rig is always our best attempt to make the cyclic behave properly.