Raiders depth chart: Mario Edwards has to help out Khalil Mack

ORLANDO, Fla. -- An Oakland Raiders depth chart, in late March?

Sure, especially with the fog of the first two weeks of free agency lifting and both general manager Reggie McKenzie and coach Jon Gruden giving some clarity this week at the NFL owners meetings.

The biggest switches would be on the defensive side of the ball, with Bruce Irvin saying on Twitter he would no longer be in coverage (read: he'll be a pass-rushing defensive end) and Gruden imploring Mario Edwards Jr. to help out Khalil Mack by filling a new role.

“With Mack, obviously we’ve got to get him signed somehow,” Gruden said of the 2016 NFL Defensive Player of the Year, who is in line for a contract extension this offseason.…