If you have a big lead like that, the CPU will be in catch up mode and try to pass on you all game long.
The Panthers ranked 16th in rushing defense last season, so, they were about the middle of the pack in that area.
My guess is if this was a closer game, Zeke and the OL of the Cowboys might have taken over. There are many variables of games that over ride the stats of the games.
My game was the complete opposite of yours, the Bears rushed for 89 yds and the Packers only had 39 yds, but the Packers lost Montgomery for the game and had to play catch up the whole game. I abandoned the run in the 2nd half and relied on Rodgers.