In recent years, the defensive line has been a considerable strength for the Arizona Cardinals, with big names and solid veteran players but also a tremendous amount of depth. Such depth has allowed the team to outlast key injuries on the line over the past few years (Darnell Dockett, Corey Peters come to mind) while still remaining a top-tier unit.
After Peters went down in practice last year, seemingly before he'd even had a chance to hit the field, 4th round rookie Rodney Gunter took over.
He stabilized the nose tackle position and had a tremendous rookie season for the Cardinals, making their choice for the defensive line seemingly more complicated with Peters coming back, and with the team drafting Nkemdiche.