not there and you cannot coach size and speed, but in the case of Bama, they have some pretty shady admissions going on there and they do treat their signees a lot more like cattle than students seeking an education; they are different than a school like ND.
That said, I'd have to go with, you need both talented athletes and talented coaches who are able to get the message across.
It's not like Bama has more inventive plays (play calling is a skill of Saban's) per game, they really do have the athletes who have been coached soundly to always been in the hunt for a National Championship each year.