Negative g?!
It's picky and pedantic, but I assume here the "negative g" being bandied around means g<1. If it's g<0 then that's one hell of a rotor. Unless you can accelerate upwards at 9.8m/s/s under power, it seems unlikely that you can beat a cannonball to the ground just by playing with the settings of the blades without power.
I also think there's also an issue with the idea of "wind going up through the rotor". Unless the flow slows substantially during that trip, leading to a lot of drag, that change in wind direction would help to push the aircraft to the ground.
The inrushing wind is deflected down in powered flight, pushing the aircraft up.
The same holds for autorotation, but the power for the deflection then comes from gravity rather than burning kerosene.