Stanford head coach David Shaw talks about returning quarterback K.J. Costello and his decision to stay with the Cardinal for one more year. In his junior season, Costello was named to the All-Pac-12 second team after starting all 13 games and finishing with 3,540 yards and 29 touchdowns. Costello' 3,540 yards was the second-most passing yards in a season in school history and his 29 touchdowns were also the third-most passing TDs in a season in Stanford history.