CHAPEL HILL, N.C. (AP) Amid all the changes at North Carolina under new coach Mack Brown lingers uncertainty at the most important position in a new offense.

At some point, the Tar Heels will have to figure out which of three inexperienced quarterbacks has earned enough trust to take over. And it's unclear how long it will take Brown's staff to sort through a depth chart with players offering far more potential than proven production.

The Tar Heels are coming out of spring drills with redshirt freshmen in Cade Fortin and Jace Ruder, both of whom saw limited action last season. There's also a true freshman in Sam Howell who provided a notable early recruiting win for Brown. For now, Brown has told them to not to worry about the depth chart while learning an "Air Raid" scheme that seeks to blend in power running concepts, too.