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Crennel was out of coaching last year after being fired as the Chiefs head coach following the 2012 season. He was only the head coach in Kansas City for 19 games, having been hired on an interim basis to coach the final 3 games of 2011. Crennel was 4-15 with the Chiefs. Prior to that, Crennel was the head coach of the Browns from 2005 to 2008, going 24-40 in that four year span.
Success has eluded Romeo as a head coach, but the man known as "Rac" is still highly regarded as a defensive mind thanks to his time as the Patriots defensive coordinator. Crennel's stingy defenses helped the Patriots win the Super Bowl in three of his four years in New England.
Crennel is reportedly the "overwhelming favorite" for the Houston job. If hired, he'll share a connection to the Patriots and Bill Belichick with his head coach, Bill O'Brien. He'll also inherit a roster with personnel already in place suited for Crennel's preferred 3-4 scheme. That JJ Watt guy is pretty good, I've heard.