Did the packers loss help the Cowboys?

Not really, the Packers hold a tiebreaker over Dallas so the Packers are still the 5 seed and Dallas is still the 6 seed. The only way it helps is by not allowing the Packers to clinch a playoff spot and leaves both wild card slots open. A Giants loss will help more because it will put both the Cowboys and Packers two games ahead of the Giants and put them in a position where they both control their own destiny.