Mack's greatest asset is something that I'm not sure can be taught or learned. He has near perfect memory - like eidetic memory - when it comes to people - faces, stories, etc. I believe it is a key component in his ability to relate to HS coaches and recruit. A lot of Mack's persona - as seen on TV - seems phony or forced, but talk to anyone who has spent 5 minutes with the man and you get a much different picture.
One thing he should learn from Mack Brown: You don't freestyle Texas Fight.