I agree and disagree. The way I see it. There are two kinds of kick back.
One: "Tip kick back."
This as we all know to well.

Is due to a bar tip hitting an object from the wrong place on the tips circumstance while the chain is spinning. The more horse power, faster the rpm, and shorter the bar. The more severe the tip gets thrown back at you! A dull chain definitely dose not help prevent tip kick back.
Two: "Top bar rail kick back"
This is more common with bigger saws and longer bars while bucking or limbing with the top rail of the bar. Also know as "back bucking".
The chain is running forward on the top rail. Without the operators proper and strong hand hold on the power head and/or proper chain speed. While buck bucking or back limbing. The cutters on the chain can instantly grab hold of the wood. The result being either slowing the chain speed, or stopping the chain completely. While also pushing the power head back at you instantly and exposing more bar out of the wood back at you at the same time! As the bar comes out of the buck it now is being released of the load on the chain cutters less and less because there are fewer and fewer cutters in the wood as the saw is pushing back out at you. This is one of and probably the most common causes of chain saw lacerations across the top of a person's thigh! Even if you let off the throttle! It can be to late because it can happen instantly. This is more likely to happen with the sharper and more aggressive saw chains like Full skip Square grind and such. DO NOT! Get me wrong. It can happen with any size saw running any type of chain. Hope my $0.02 helps!
Cut safe, stay sharp, and be aware!