Doug Marrone has only ever been the head coach of one NFL team and that is the Buffalo Bills during the 2013-2014 season. In that year, Marrone led the Bills to a 9-7 record, breaking there previous streak of 9 consectuive losing seasons. Marrone did all of this with journeyman Kyle Orton as their quarterback. However, Marrone resigned after the Bills failed to miss the playoffs by just two games. He expected to receive a head coaching job elsewhere, but failed to land such a job. He spent this past season as the offensive line and assistant head coach to Gus Bradley as a member of the Jacksonville Jaguars.
Marrone got his shot in the NFL after being the head coach of the Syracuse Orangemen from 2009-2012. Marrone is known for getting the most out of his players, which was evident during his time with the Bills, with quarterback Kyle Orton and runningback Fred Jackson has his primary playmakers. Marrone split his two games against the Dolphins, winning at home in week 2 but later losing to the Dolphins in Sun Life Stadium in Week 11. Other notable wins for Marrone from his lone season as HC of the Bills were a win over the Green Bay Packers at home and a win over the New England Patriots in Week 17 in Foxborough.
The question remains: what can Marrone bring to Miami? Marrone's main pitch will be what he did with a below average Buffalo Bills team just a season ago. He took a team with considerably less talent than the Miami Dolphins and managed a winning season, something the Dolphins have failed to accomplish in the past four seasons under Joe Philbin and Dan Campbell. Marrone knows all of the X's and O's, and has served as both an OL and TE coach in both college and the NFL during his coaching career.
The likelihood of Marrone coming to Miami is somewhere in the medium range. As of now, he appears to be of medium interest, as guys like Mike Shanahan and Sean Payton are the obvious front runners for the position. However, what Marrone has on his side that a lot of other candidates don't is experience (though it may be limited) and success (also may be considered limited) at the head coaching position.