Wow, there is a lot of supposin'. The examples of the see saw are static examples. If you hang the blades staticaly they will balance all day, but we spin these blades. It has nothing to do with gravity, but rather FORCE.
The definition of center of gravity is the theoretical piont of an object that acts as if the entire mass of the object is centered at that point. Forget about gravity. Gravity has nothing to do with a spinning rotor on a knife egde. It is all about FORCE.

The force of a spinning object (rotor blade in this case) is dependent on three variables: mass (m), speed (v), and distance from the center (r=radius). If the cg of the blade is at a different "r" form the center, it is easy to see that :1- it will be traveling in a bigger circle and therefore at a different speed and, 2- the radius will be different from the other blade.

When you do the math it will come out as mrv^2. If the mass is the same for each blade, you can cancel out the "m" and the equation becones F=rv^2.

For blondes, this means that any change in speed has some drastic changes in force. The speed changes as the cg changes in "r".

You can dynamically balance a prop with a weight on one end, but it will be in balance for only a specific speed. It may be in balance at 20000 rpm but not at 10000 rpm.

The people with great websites are not necessarily experts in helicopters, and there are a lot of posers out there.