Mathieu's versatility made up for the fact that he missed the last three games due to a knee injury.
"If we're going to have a slot receiver then we need a slot corner. In a heated discussion, the complete play of Mathieu -- who played base downs as a safety and moved to the slot in the Cardinals' nickel and dime packages -- won out despite him missing time toward the end of the season," PFF wrote.
As for Bethel, who made his first Pro Bowl this season, in just his second season out of Presbyterian College, the decision to name him to the All-Pro team is a no brainer.
"Bethel was superb and played in a way that made this the easiest of selections. They don't make special teamers like him," PFF wrote.