Do you think this book mean anything when players, agents and GMs go into contract negotiations and they pull out the statistics/production sheet to justify how a player is going to be paid???
If you've followed this game as you claim, then you'd think you would have figured this out by now.
Just about every big free agent signing ends up being regretted by the team that did it. Almost every time. Always based on garbage stats and measurables that don't equate to performing when it matters most. Ever notice that the team with the best "stats" lose the game more than half time time? That's because they're useless when it comes to winning.
That's why bad franchises do it routinely.
NFL talent evaluators are horribly inept and wrong far more than they're right. They work in the buddy system and the "my dad was an NFL guy so I am, too" world of logic. Owners are solely built for making money, and the salary cap ensures them hundreds of millions as long as they pretend to try by spending money to the cap. Winning is a cute little bonus in a passionate hobby for them, but nothing more. The cap ensures massive profits and a built-in excuse for not spending into that gaudy margin.
NFL teams are some of the worst-run businesses imaginable, but it doesn't matter. Owners are safe with the TV contracts, so their NFL team is their personal fantasy football team. Just a fun hobby that makes money out of thin air.
Actual winning happens when rosters perform when it matters most, not because the left defensive end racked up 12 sacks against sub-.500 teams in September. Or when Dak throws for 300 yards in the 4th quarter to turn a 30-point loss into a 10-point loss. Winning is a construct of a like-minded and well-fitted roster. That's why in the 70s and 80s, it was the same teams over and over for a decade at a time. Now with unbridled free agency, it's like pick-up football in the cornfield on the weekends. Less quality, but quicker opportunity to find the magic formula.
All that is to say football is far more complicated than meaningless statistics. Teams like Baltimore, Pittsburgh, and New England understand this. They let go of most of their big stats guys who want to get paid. They know what consistently wins, and stats aren't it.
Numbers are like dancing monkeys. You can make them do whatever you want, but that doesn't make them intend to mean anything.