I didn't see where Sagarin was referenced. Just the chart showing BYU ranked 18th based on w/l.
Coaches do get credit. But Bronco's w/l record also is a tale of two cities. His record using Crowton players is very different than his record using solely his own recruits. It looks a lot more average starting in 2010 after 99% of Crowton's players were gone. Thats where a lot of fans get their dissatisfaction. They're happy with his first 5 yrs, not so much with the last 5.