The Cowboys have hired Dolphins quarterbacks coach Jason Garrett as their offensive coordinator, and he remains a candidate for Dallas' vacant head coaching position, ESPN's Chris Mortensen reports. A source told ESPN's Ed Werder on Wednesday night that team owner Jerry Jones considers Garrett, a former backup to quarterback Troy Aikman, to be one of the most promising offensive coaches in the league and was so determined to bring him back to the Cowboys organization that he would have been added to Bill Parcells' staff had Parcells decided to coach the final year of his contract.