The Pac-12 has been called the Conference of Quarterbacks and it looks like it will really live up to that this season. USC’s Sam Darnold leads a strong group of returning QBs, including Jake Browning of Washington and Josh Rosen of UCLA. But there are some newcomers, too. Oregon State has community college transfer Jake Luton, while Utah’s Tyler Huntley wrested away the starter’s job from a senior incumbent after a glimpse of the field last season. A primer for the quarterbacks that will lead the league’s teams this season: SAM DARNOLD, USC: When fans last saw Darnold, he was throwing for 453 yards and five touchdowns in USC’s comeback win over Penn State in the Rose Bowl. As a redshirt freshman last season, Darnold started 10 games and threw for 3,086 yards with 31 TDs.