Chris Mortensen is reporting on Twitter that Dallas Cowboys offensive line coach Hudson Houck will retire after 29 years in the NFL and be replaced by Bill Callahan, who was most recently the offensive line coach of the New York Jets.

We've been talking about possible Cowboys coaching changes. It appears as though Dave Campo is out as secondary coach as well, after 18 years with the team. These two moves indicate a desire by head coach Jason Garrett to move on from some of the structure that was in place when he took over and put his own stamp on the coaching staff. Coaches who may have been retained largely out of habit are being scrutinized and evaluated the way coaches are with other teams, and it says something about the way Garrett wants to do business going forward.

The hiring of Callahan is especially interesting, however, in light of the questions that surfaced this season about Garrett's ability to handle the dual roles of head coach and offensive coordinator. Callahan was thought to be a candidate to take over as offensive coordinator in New York if the Jets were to move on from Brian Schottenheimer. He's been a head coach in the NFL and has experience calling plays. He brings a level of experience to the position that could be an asset to Garrett and could improve the overall in-game performance of the Cowboys' offensive coaching staff. It's a quality-focused move that indicates a potential departure from some of the Cowboys' more stodgy ways of doing business. Wouldn't be a surprise to see more to come.