According to a source, the Cleveland Browns were denied permission to speak with Callahan about a job on Mike Pettine's staff. A source told ESPNDallas that Callahan would not be pleased if Linehan would be added.
"You make a lot of different decisions for the team and you do it always in the best interest of the team," Garrett said. "You're trying to put guys in roles where they will thrive and be best for the team and this is no different than that. Bill is a pro. Bill's been doing this a long time. He understands transition and change and all those things. He along with the rest of the staff will embrace this and hopefully as a team we'll be better."
While Linehan will be the Cowboys' third play caller in as many years, Marinelli will be Garrett's third defensive coordinator in as many years and his fourth since taking over as interim head coach in 2010.
Kiffin replaced Rob Ryan, who held the post for Garrett's first two seasons as head coach, but in 2012, the Cowboys allowed what was the most yards in a season in team history (5,687).
Kiffin's defense allowed 6,645 yards, which is the third-most allowed in NFL history. The Cowboys gave up 388 first downs, which is second-most in NFL history. The Cowboys allowed 432 points, second-most in team history. Only the 2010 defense gave up more (436).
The Cowboys gave up a record four 400-yard passing games to quarterbacks. They had five quarterbacks throw four touchdowns in a game, including two from backups in Chicago's Josh McCown and Green Bay's Matt Flynn. The New Orleans Saints put up an NFL record 40 first downs against the Cowboys in the Nov. 10 meeting. They allowed six rushers to eclipse more than 100 yards in the last eight games.