1 part Garrett and 1 part Jerry.
The Jones' stripped Garrett of play calling duty after yet another abysmal 8-8 2012 season and gave it to Callahan in 2013, who was up in the booth. Jerry basically placated it all by saying "We feel that Jason should be allowed to fully focusing on the game".
Later in the 2013 season, it was suspected that Garrett reverted back to calling the plays (like many suspected of happening last year, too). Unhappy with getting jerked around by Garrett, Callahan put some feelers out to other teams that off season. Big Daddy put the kibosh on that and made Callahan live out the last year of his contract as the "running game coordinator" while one of Garrett's former Miami chums in Linehan became the "Passing Game Coordinator". After the final game of the 2014 season, Callahan was seen outside of the Cowboy's Stadium burning all of his team gear in a 55-gallon drum, followed by shaving his head of all hair and then rendered a one-finger salute towards the team facilities before taking off on foot in an Eastward direction. <Cameras peel back from the Stadium parking lot to reveal Garrett spying through the mini-blinds with a smirk on his red face. He had one again.>