USC football mailbag: Will there be a real spring quarterback competition?

USC’s long winter is about over. Spring practice starts next week.
The events of the past three months have been consuming around Heritage Hall, starting with athletic director Lynn Swann’s decision to retain Clay Helton after a 5-7 season, the dismissal of about a third of the coaching staff, the hiring followed by quick exit of Kliff Kingsbury as offensive coordinator, the departure of top recruit Bru McCoy and the arrival of Graham Harrell to replace Kingsbury. I think that covers