1) vs. Utah 2011 (10-54)
2) vs. USU 2014 (20-35)
3) vs. Utah 2008 (24-48)
4) vs. FSU 2009 (28-54)
5) vs. Washington 2013 (16-31)
6) vs. TCU 2009 (7-38)
7) vs. TCU 2008 (7-32)
8) vs. Michigan 2015 (0-31)
9) vs. USU 2010 (16-31)
10)vs. Virginia 2013 (16-19)
11) vs. BSU 2012 (6-7)
12) vs. Nevada 2014 (35-42)
13) vs. Arizona 2006 (13-16)
14) vs. Tulsa 2007 (47-55)
15) vs. Memphis 2014 (48-55)

My rationale was blow out losses are the worst kind of loss for a program of BYU's caliber, particularly against in-state rivals, and especially with Bronco specializing in defense. A defensive-minded HC should be able to keep the other team from scoring often, so that the game is always within reach, even if you don't always get the win.

I can't really put Missouri any higher than 12th on Bronco's worst losses, because Missouri is an SEC team, the game was close, back up QB/RB, offensive line just barely returning to action against a great defense, and really I put more of the blame for that loss on bone-headed penalties by the players than Bronco necessarily being out coached.