Earlier this month, ESPN's Chris Mortensen reported Cowboys owner was pushing Garrett to relinquish play-calling duties.
On Jan. 13, the team hired Callahan to be the offensive coordinator, a role incorporated into Garrett's head coaching responsibilities. Callahan, who will also coach the offensive line, replaced Hudson Houch, who retired as the team's running game coordinator.
Callahan spent the past four seasons as the New York Jets' offensive line coach and assistant head coach. Before that, he was the head coach of Nebraska and the Oakland Raiders, where he led the Black and Silver to Super Bowl XXVII.
Speaking of which, earlier today this story made headlines. Tim Brown suggested Callahan changed the Raiders' game plan less than two days before the Super Bowl out of loyalty to former Raiders and then-Tampa Bay coach Jon Gruden.
"We all called it sabotage...because Callahan and Gruden were good friends," Brown said. "And Callahan had a big problem with the Raiders, you know, hated the Raiders. You know, only came because Gruden made him come. Literally walked off the field on us a couple of times during the season when he first got there, the first couple years. So really he had become someone who was part of the staff but we just didn’t pay him any attention. Gruden leaves, he becomes the head coach....It’s hard to say that the guy sabotaged the Super Bowl. You know, can you really say that? That can be my opinion, but I can’t say for a fact that that’s what his plan was, to sabotage the Super Bowl. He hated the Raiders so much that he would sabotage the Super Bowl so his friend can win the Super Bowl. That’s hard to say, because you can’t prove it."Ironically, Gruden was connected to the head coach and offensive coordinator position for the Cowboys as the off-season began.
Follow Sam on Twitter @SamSpiegs