Not denying Cook is superior to Ray Davis. He absolutely is. But this comparison clip is total BS.
Watch carefully. It's O'Cyrus Torrence's job to come across and block the hole open. When Davis ran the play, the center and inside rusher block his path and Davis gets swallowed up. When Cook runs the play, Torrence makes the key block springing Cook. So this is not as "black and white" as @HappyDays claims. It's more an example of a play blocked correctly versus not.