Maybe I dont fully understand the Hookes Joint effect but if I understand it correctly then in the Bell / Robinson system the following occurs (please correct me if Im wrong): When the advancing blade attempts to flap upwards, the position of the teetering pin causes the blade cg to move away from the rotor mast / drive shaft. This blade will try to lag (or slow down like an ice skater opening her arms in a spin) while the other blade experiences the exact opposite effect and thus attempts to lead (accelerate).
The lagging force experienced by the advancing blade will work against the force of the rotor mast trying to rotate the blades through the air while the leading force of the retreating blade will then cancel this by applying an equal and opposite force to the rotor mast (in theory right?).
If the pivot is placed lower than current designs, this arrangement will be opposite with regards to the leading and lagging forces of the advancing and retreating blades, yes, but how will this affect flight performance?