It's hard to have these discussions because some just refuse to acknowledge basic givens. Stats are not the be all, end all because stats can be manipulated to represent certain facts that may not necessarily be 100% accurate. As example, if you have a pitcher who has a major league fastball and that's it, he is likely going to be really good the first half of the season but, over the second half of the season, hitters are going to figure him out and he is going to get touched up for a few in the second half. Is that guy a good pitcher? The answer is no because as time goes on, his record is going to get worse and worse as seasons pass. You can hid his deficiencies for a period of time but eventually they will come out. Same goes for NFL Offenses. If a QB can't throw a certain type of pass very well, the Offense calls plays that the QB does well and percentages go up. However, over time, good DCs figure out what QBs can and can't do. When it's time to win or go home, good DCs devise game plans that take advantage of what you can't do and they force you into that. That's when shortcoming in your game surface and that's why stats can lie.
For example, the game has changed so much that you really can't compare QB stats from years ago to stats from today. On top of that, the game is so geared towards the pass and making it easier for QBs that it skews any statistical comparison. It's really a dishonest comparison to try and compare those QBs to today's but people will not acknowledge that and so, from the very start of the discussion, you have no foundation from which to even begin having an honest conversation. People see what they want to see. I just hope that both Dak's camp and the Cowboys see things for what they really are and come to a consensus, somewhere in the middle. That's about the best you can hope for IMO.