Two important items here:
1) Duke Williams, the talented wide receiver who was suspended for the first part of fall camp, is listed as an "OR" starter. Williams had been running with the second team since his return to practice, and most folks who cover Auburn believed that he wouldn't start but would play the same amount of snaps as a starter.
2) As expected, Roc Thomas is Auburn's starter at running back, but Gus Malzahn said today that all three listed backs will play against the Cards.
Here's the complete depth chart:
OFFENSE
QB
6 JEREMY JOHNSON (6-5, 240, Jr.