sycamore,
Good point of view, and great story about the Gazelle, although I do disagree in that a loss of control is a very poor way to prevent stall (could be the tree you are avoiding is worse for your rotor than some stall induced loads on the controls, for example).
The point I am sticking to is that jack stall is Caused by rotor stall, because the blade pitching moment increases due to rotor stall. Yes, one might start earlier than another but they are both part of the same physical situation.
Look at the lift and moment plots on this paper (Cn is the normal force, like CL, and Cm is the blade pitching moment):
http://ho.seas.ucla.edu/AeroMEMS_htm...es/Control.PDF