An engineer steps in...
"But, if one blade has more pitch then the other, not just for PART of a cycle, but ALL the time, then the blade reaches a new coning angle and stays in one plane, despite what the lift of the other blade is."
Hmmm, nobody here has mentioned the fact that rotor hub shaft stresses are likely to exceed material fatigue stress from the continuous undemanded cyclic input. If i was the guy that released that drawing i would specify the highest tensile steel for the rotor hub, keep stresses well below half UTS and still loose sleep over it! Better to specify an out of balance tolerance...
"A brief look at history."
I laughed very hard when i read this...
Mart