When we had our 76A at beginning of 80s I don't recall "Collective Drive" being discussed at original American Airlines Ground School or subsequent Flight Safety Sim visits. However I did encounter Collective/Pedal interlock which was subsequently put down to the Pitch Change Shaft jamming, I believe because tho splined for 6? only fitted with two keys. At cruise position the keys chattered and wore notches thus if keys not exactly in line with spline, the shaft couldn't move, so everytime tried to move pedals collective moved.
Don't see this would cause anything as dramatic as this accident and has probably been addressed in subsequent 20+years.