Wow this is alot. I have breezed through this and would like to make a comment without looking at any video.
When you grab a rotor on a Mopar dist and turn it some with your hand while the dist is in the car the rotor and reluctor turn together. So if the rotor is set to be aligned with the cap terminal when the reluctor lines up with the pick-up coil to fire the coil then since the reluctor and rotor move together the rotor wont move and will stay aligned with the cap terminal when just the mech advance works. Its very simple as all that happens is the rotor and reluctor line up sooner since the mech advance has moved the reluctor and rotor together and every time the reluctor and pick-up line up the rotor will be aligned with the cap terminal. All that happens is the rotor and reluctor still line up but they are lining up sooner now like when the crank is say 30 degrees BTDC and they will line up the same at 10 degrees BTDC only at 30 degrees they get lined up soon then at 10 degrees. The mech advance is moving the top of the dist shaft as per say but it moves the reluctor and rotor together and they will still line up with the pick-up coil when the rotor and cap terminal line up. Ron