The NFL would be the one solely responsible for ensuring every ball was exactly the same.
Once all the balls were properly inflated based on their own rigorous guidelines you could put them in a bag and someone could randomly pull out a ball.
The balls should, if the NFL followed their own rules, all be exactly the same. Neither team could manipulate the air pressure.
If the problem is teams allegedly manipulating pressure to their advantage that problem would be eliminated once and for all.
The “legal range” of pressures was just Wilsons recommended pressures for the care and use of a football, instituted at some unknown time before 1940. It was about giving players a ball they could use, not about anything else.
Starting with pre-game measurements at 72F indoors, the PSI of footballs varies by almost 6 PSI between the warmest games and the coldest games each year, and in the 50F range, *varies* up to an additional PSI according to how wet it is. Balls on top would also be notably different pressure than those on the bottom if hit by sunlight or near the warmers. Heck, balls held by the ball boy or ref would vary by more than the NFL was actually quibbling about, depending upon how long they held them.
None of that is actually in opposition to the Wells report data and formulas - they just were very dishonest about what they found, and what they were telling you that graphs represented.
No one cares except as a gotcha.
See Addendum B in the following for some nice graphs on historical pressures.
https://cbsboston.files.wordpress.com/2016/05/physics-professors-deflategate-filing.pdf