DeMarco Murray never felt comfortable leaving a game last year. He wasn’t sold on the running back depth behind him to handle the duties.That’s changed this year.Murray has grown confident in his replacements, notably Lance Dunbar and Joseph Randle, to fill in capably when he’s out of the game.“Me not wanting to come out last year was because I wasn’t sure if things would go right,” said Murray, who had his first 1,000-yard rushing season. “But these guys playing the way they play and practice the way they practice, I’m very confident that if I come out they can continue to carry the load and do some great things for us.”The Cowboys have said they’re going to emphasize the running game, as well as the screen game. That’s something that should suit Murray and the rest of the running backs well.The Cowboys were a pass-heavy team last season. They had only one game in which they had more rushing plays than passing plays – their 31-7 victory over St. Louis in Week 3.Some weeks, the pass-to-rush ratio was almost comical. They threw 51 times and rushed only nine times in a 27-23 victory over Minnesota. In their 37-36 loss to the Green Bay Packers, they had 48 passes to only 18 rushes. In the season-ending loss to the Philadelphia Eagles, they had backup Kyle Orton throw it 46 times and rushed 18 times.