So basically,,,,
9 grams off the clutch assembly would be roughly equal to only 3 grams off the flywheel. In effect,,,
Correct?
Yes, if you took 9 grams off the clutch assembly at the exact same distance from the center of the clutch (lets say at 2 inches from center of the clutch) it would be roughly equal to removing 3 grams off the flywheel at 2 inches from the center of the crankshaft.
Removing alot of weight near the axis of rotation does almost nothing to reducing the moment of inertia but it will act like you took one happy meal's worth of weight off of your butt or bike.
A flywheel will be the most effective flywheel if all of the mass is concentrated at the farthest distance possible from the axis of rotation.