Beebe was okay, especially for snapping the football for the first time in his career. I do think he needs to get better, and I think he will.
If you watched the Vikings-Lions game and saw the holes Ragnow was helping create for Gibbs, you have to figure Dallas needs to get a lot better on the OL. Dallas RBs simply do not see those kind of gaps to run through. They used to when Martin was 100%. In fact, before Steele and hurt, he and Martin were bulldozers on the right side of the Cowboys OL.
Also, I am not convinced Guyton will be much better on the right side of the OL. These days, there are pass rushers on both sides of the defense, or DEs move around. Whatever he can't do on the left,, I am pretty sure won't get much better on the right. He appears to be lacking upper body strength. That needs to improve in the off-season. Once he can control rushers with his hands and arms, he will be fine. But it requires him to put in the time and effort.