There appears to be some mystery about what happened with former New Orleans Saints quarterback Derek Carr, before he decided to retire from the NFL. The Saints front office and even some players were apparently confused as to why he was dealing with a shoulder injury,

After Derek Carr's retirement, Drew Brees isn't ready to anoint Tyler Shough as the next Saints starting quarterback. Here's why.

Derek Carr ran out of gas. Carr, 34, announced Saturday that he is retiring from the NFL rather than undergoing shoulder surgery —to repair a labral tear and damage to his rotator cuff — that likely would have ruled him out for the season.