Lu,
What I was saying was that the collective shouldn't be lowered until all movement stops. This is because at very low RPM such as will be experienced at the bottom of an auto, you don't have much in the way of direct response to your cyclic inputs. Therefore, any blade flapping may lead to exaggerated disc movement and possible contact with parts of the airframe as you are bouncing along.
The collective should be held where it was when you finished cushioning on to the ground, definitely not lowered, as that would increase the likelihood of the blades getting low enough to strike the airframe.
The 'blade stalling and dropping' idea that you expressed above doesn't apply - even though they may not be flying very efficiently at these low speeds, positive pitch on the blades will always help to hold them up until you're ready to lower them (gently).
I was concerned because what you said in the post a few above seems to suggest that the collective should be lowered before the blades get slow enough to stall and drop quickly, allowing them to strike the tailboom or whatever.
That is what I was referring to as being a crock, and instead I would encourage pilots to definitely not lower the collective until all sliding or rocking motion at the bottom of an auto has ceased.