As I understood Belichick, he was saying that what they do before the game causes inflation tin the psi -- that is makes it higher than a ball that had been sitting in a room all night would, so that when the official measures it or inflated it or deflates it to 12.5, it stll has room to drop over the next 2 hours that it sits in a bag in the officials' locker room. So now it starts the game already lowet than 12.5, and colder temps bring it even further.
We don't know if the Colts' balls stayed static, just that they stayed in range.
If the Colts' balls did stay static despite a 25 degree temp drop, then they defied physics unless some other process warmed the air inside.
So, when everyone reports "stayed the same," they likely mean "stayed in range".
The last point Bill was getting at was I think a pretty important one. They were basically asking him what they should do about the balls next week, and I think his point was that fluctuation is not just natural but inevitable, and if playing with balls in a 1 lb. range is what you hope to achieve, it's unachievable, or certainly not being achieved right now. Two identical balls prepared in identical ways and measured exactly the same indoors 2.5 hours before a game will have a nearly 2 psi difference if a game is in Green Bay instead of San Diego. So, the NFL is not playimg games with the same balls. And if the Green Bay ball starts at the low part of the accepted range and the San Diego ball at the high end, you are at nearly a 3 psi difference. If Bill is right that you can affect a ball temporarily another 1 psi by how you prepare it, this is a 4 psi difference.
The rule is written and this whole procedure is created as though a 1 lb. range is sacrosanct. I think what Bill was saying is that if your goal is to get 12.5 to 13.5 balls at one exact moment in time 2.5 hours before the game in a contolled 70 degree environment, then congratulations. Your rule and your referee procedure are perfect. But if your goal is to PLAY with balls that are 12.5 to 13.5, your rule sucks, and worse all you dipshits who think they are the same thing just cost me a week of my life I will never get back.