SumnerH said:
The ESPN sports science thing showed the 13 PSI to 11 PSI decline made the ball slower to target and not fly as far (by tiny amounts), and very slightly grippier.
I'm not sure there's an objective way to balance "doesn't go as fast or far" vs. "has more/less grip" to say that X PSI is an advantage. Obviously either Aaron Rodgers or Tom Brady is wrong about what's best, or the number varies from person to person.
Any performance impact assessment would need to football flight characteristics throughout the range of inflation pressures based on empirical testing. Also for compression/indentation, and yes, even grip/friction could be tested at discreet pressures.
Other critical variables would also need to be quantified, such as:
1. QB grip contact area (QB hand & finger & glove dimensions vs load)
2. Ball conditions (scuffed? contaminated? asymmetric?)
3. Football manufacturing variations (inner liner thickness variation/leak rate of football valve/stitch variation and integrity,Wax & other football coating uniformity)
4. Environmental contributions
5. Within-QB and between QB-performance differences- (throwing angle/grip location)
More than likely, by a considerable margin, this impact is negligible when compared with the above 1-5 other variables.
With out having a checklist stating the pressure measured, the serial # of the football (do they even have individual ID's?), and the time and date this is simply a lesson in poor quality assurance.
To assume malfeasance in the absence of actual Quality Assurance only amplifies the incompetence we are dealing with, and does more to tarnish the NFL than 0.1 PSI 0.2 PSI or 10 PSI difference.
The NFL got caught having ridiculously poor quality assurance practices, and is now trying to nail the Patriots for it, or is at the very least hiding behind an investigation while the Patriots are skewered 24/7 by almost everyone.
The reason they did not have better control? they more than likely felt it was not important...