who finished with a winning record?
They beat Stanford and Oregon.
BYU had a winning record, too, but technically aren’t P5.
In 2017, they also beat two P5 teams who finished with winning records. Arizona and then West Virginia in their bowl game.
In 2016, they beat USC and Indiana (bowl game).
In 2015, they actually had four (Michigan, Oregon, California, and Arizona State).
In 2014, they had three wins (UCLA, USC, and Stanford).
In 2013, they had one win (Stanford).
In 2012, they didn’t have any.
In 2011, they had 1 (bowl game against Georgia Tech).
So in their eight years of of being in the PAC 12, they average just under two wins each season over P5 teams who finish with winning records.