Why then not compare both QBs in question for the game? If it's just trying to make a comparison?
Since no one can provide me with where those stats were pulled from other than a screen shot from sports talk show, let's use Stat Muse
Over last 4 seasons
Games where each team was an under dog record:
Cowboys 8-12 67%
Eagles 4-16 25%
See, this is how you compare things you look at both parties not just one. By looking at these numbers we see over the 4 year period the OP stipulated we see the Cowboys have a much better winning percentage in games where they are underdogs vs the Eagles.
See how this makes the story more equitable to discuss vs just pulling a stat for one QB which is actually a team stat not QB stat?