Christian Parker was given a tough task this offseason when he was hired by the Dallas Cowboys as their new defensive coordinator . Parker is taking over a unit that struggled in every facet, and needed an overhaul. First, Parker put together an impressive collection of assistants , then the front office got to work adding talent through the draft, free agency, and trades. This past weekend, the Cowboys were able to see Parker in action as he coached up the rookie class during their rookie minicamp. Head coach Brian Schottenheimer was impressed with what he saw , and even those outside of the building are singing the praises of Parker. Christian Parker is key to Super Bowl hopes in Dallas Dallas Cowboys DB Caleb Downs is coached through a drill with defensive coordinator Christian Parker. | Chris Jones-Imagn Images That includes ESPN's Peter Schrager, who said Parker might be the NFL's " most fascinating person ," and is the reason the Cowboys could be Super Bowl contenders this season.…