Cowboys have Eberflus under contract, so if they want to keep him there's nothing St. Louis can do about it. Besides, I'm not sure how much power Ryan will have to hire assistants in St. Louis. This isn't Dallas where he's given free reign to run the defense however he wants while Garrett runs the offense. He's working under a defensive minded head coach who has already had a defensive staff in place for the last year. I'm not even sure where Ryan ranks in the pecking order of the defensive voices in the room, because there's Fisher and Fisher's long time right hand man Dave McGinnis and NFL vet currently titled "Assistant Head Coach".