re: What is it about Nick Saban that makes him such an extraordinary Head Coach?

Saban has a template for every position on the team. Players almost always fit that mold.
Look at the 3* players he brings in, red shirts and makes players who are key parts of the team. He is a master at looking at a Sr. In high school and seeing what he can become.
Besides that ability add the work ethic he becomes the GOAT.