Can't wait for the rest of the story. Just the fact that there is even a rule about ball pressure in the NFL Rule book means that ball pressure deviation has always been a common practice over the years. I'm betting that at one time every team did it based on weather conditions/personal preference. It was probably a rule that no one really cared about and was probably not a big deal because each team uses their own balls. I was researching this a little and found that underinflated balls are harder to throw and catch, but easier to grip.
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