With his lack of speed and ability to create his own yards, Najee is third-round talent drafted in the first. Those Bama teams were stacked at every position on offense making the RB quite possibly the player defenses had to worry about the least.
Speaking of Purdy, what a perfect QB for San Francisco's offense. They didn't need anything special in terms of athletic ability, arm strength, etc. They needed a QB who could make all the throws and operate within that system and Purdy has been terrific.