[According to pro-football-reference.com...]
Drew Bledso started 6 games, and the team was 3-3.
Tony Romo started 10 games, and the team was 6-4.
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Quarterback
October 23, 2006
In October 2006, Tony Romo became the Dallas Cowboys starting quarterback, replacing Drew Bledsoe.
Since the 2006 season, the Dallas Cowboys are 2-and-4 in playoff appearances with Tony Romo as the starting quarterback.
The starting quarterback of the 2011 Dallas Cowboys is Tony Romo.
In 2013, Dallas Cowboys quarterback Tony Romo signed a six-year extension with the team worth $108 million, with 55 million guaranteed and $25 million in bonuses. He has been the quarterback in Dallas since October 2006.
Veteran Kyle Orton is the Dallas Cowboys' No. 2 quarterback for the 2012 season.
The Dallas Cowboys have had three Super Bowl quarterbacks:Craig Morton (Super Bowl V).Roger Staubach (Super Bowls VI, X, XII and XIII).Troy Aikman (Super Bowls XXVII, XXVIII and XXX).
In 2002, Quincy Carter was the Dallas Cowboys starting quarterback. His backups were Clint Stoerner and Chad Hutchinson.
Tony Romo took over from Drew Bledsoe as starting QB in the 2006 season.
Troy Aikman
Roger Staubach