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One of the more anticipated camp battles will be at left guard as the Cowboys try to find a replacement for Ronald Leary, who left in free agency. What makes this potential battle so intriguing is, as of now, we are not even sure who the main competitors will be for the job.
The expectation is that former first-round pick Jonathan Cooper and third-year player Chaz Green will likely compete for the job in camp. Both have struggled to stay on the field in their short careers, but it's clear each has enough talent to certainly warrant a starting spot on one of the best offensive lines in the NFL.
Cooper has more experience at the position than Green, but the former is now on his fourth team after being drafted seventh overall in the 2013 draft. He's started just 14 games in his four-year career, and after studying him on the field, I believe injuries have severely robbed Cooper of his elite athleticism.
However, Cooper played well in his three starts last season and has dramatically increased his play every year since being in the NFL, according to Pro Football Focus. Ideally, Dallas would love Cooper to win this job, as it would allow Green to stay as the swing tackle on game days.
Green will get the first shot at winning the job, and he should succeed if he can stay healthy. In OTAs and in mini-camps, Green worked with the first-team at left guard. The Cowboys have more invested in Green as he was a third-round pick in 2015, and I believe they think he can be a better-than-average guard in the NFL.
If neither wins the job and/or fails to stay healthy, expect the Cowboys to use veteran Byron Bell until they find a better option. While the left guard position is arguably the least valuable position on the offensive line, the Cowboys have prided themselves in not having a weak link among their unit. This is a spot that may not be decided until the first week of the season.
Projected Winner: Chaz Green
Source : http://bleacherreport.com/articles/2721677-dallas-cowboys-5-biggest-training-camp-battles