dave
coning angle reduces thrust. by pushing the inside of the blade down (the elbow) coning is increased.
you said > In a very general sense, the teetering rotor is no different from the articulated rotor. Both have tip path planes and mast planes. These planes are not parallel to each other during most flight conditions.
NO dave this is wrong. you missed out one thing, the rotor head plane, which is the same as the mast plane on a fully articulated or solid rotor systems aswell as your drawings. however on teeter systems the head is always parallel the tip plane (please explain if it is not). As the head (not the mast) is the spinning axis for the blades, the angles from the blades to the spinning axis (head) never change, the blades CAN'T flap seperatly so no lead and lag is needed.