The only explanation for those hoping for a gauge/inspection/weather explanation is that the Colts footballs started out on the highest side of the range and the Patriots were on the lowest side of the range. The Pats could also try to argue that they inserted hot air into the balls instead of room temperature air, but that seems far fetched. But that still would not explain away all of the difference.
And not being a science geek, I am not sure if testing the Colts balls after they tested NE's (halftime and post game) would raise the pressure enough that it appeared that Indy's footballs did not lose pressure when they could have. Just spit balling . . .
Even if the Pats started out at 12.5 and the Colts started out at 13.5, it would stand to reason that if the balls were all affected by the same weather, they'd all lose similar amounts of pressure.
If the Pats' balls all lost 2+ PSI, anything more than a drop of 1 would also make the Colts' balls illegal too. But they weren't.
Trying to justify how ONLY the Patriots' balls got deflated is pointless. The only question is who did it, when they did it, how they did it, and if anything can or will be proven and made public.
And when you have quarterback who's that detail oriented about everything, has thrown a football millions of times, and knows exactly how he likes his footballs say he didn't notice any difference, it reeks of being a lie. He's been called out by current and former players and coaches about it, and if he's lying, there's probably a reason.