He played almost exclusively man at New Mexico, yet he's too stubborn to do it at BYU? Really?

Maybe it's because Bronco knows that if he takes out above average linebackers to put in below average DBs, that the opposing coaches will lick their chops and go to town on the secondary. So, Bronco does the best that he can with what he has... a zone heavy scheme with really good linebackers. And once in a while he got burned by calling a blitz and leaving a LB on a WR and the QB recognized it and made him pay. You remember the few times that happened, but you don't remember the many more times where his scheme did exactly what it is intended to do.

Sorry - with the nationally respected defenses Bronco has put on the field given the personnel limitations he has to deal with, you have absolutely zero credibility.