I think it's more likely than not that something went on, with Brady's knowledge and encouragement, but in the scheme of things it's trivial.
Apparently you haven't read the Wells report yet, nor have you had the opportunity to factor in the interesting perspective from many insightful and intelligent posters on this message board.
Bottom line #1: the only things that can be
stated for certain based on the Wells report, are the following:
1) TB has always had certain preferences for how he likes his footballs, pressure being only one of the characteristics involved. Virtually all starting QBs in the NFL have preferences, some of which are similar to TB's... some not.
2) TB was highly miffed when he had to play with balls that were inflated to 16 psi earlier in the season (Jets game). As a result, he evidently looked up the rule for the psi levels to find that a range of 12.5 - 1.5 psi was specified. He was so irate that he had the ball boy (McNally) bring a copy of those rules to the umpire at the next home game, ostensibly to ensure that the balls were not arbitrarily inflated above the 12.5 psi level. It would be easy to understand TB's frustration at this point, knowing that the NFL officials could not even be entrusted to keep their game balls within the specified range....much less at his personal preference.
3) TB made it clear to Jastremski (and via Jastemski, to McNally) that they were to do everything within their power to ensure the balls were at 12.5 psi, which he was rightfully entitled to by the rules.
4) McNally was apparently annoyed by TB's obsessiveness and created some workplace humor (via text messages) concerning the matter. Part of that interchange (involving Jastremski) included the invoking of the "Deflator" term as it related to McNally's role. This makes a lot of sense because the underlying problem was footballs that were at pressures well above the legal range....and the need to get those over-inflated balls back into the specified range, or even better, to the
lower level of that range. If he had been Aaron Rodger's ball boy I could see him referring to himself as the "Inflator".
5) The reason McNally was such a key player in all this is because he, and he alone, was the last person to have custody of the balls before the umpire approved them, and therefore was the last possible person with an ability to impress upon the umpire that the balls be inflated (or maybe even deflated?) to TB's desired 12.5 psi level.
6) McNally took custody of the approved balls and took them to the game field, stopping on the way to use the men's room for a period of 1 minute, 40 seconds.
7) The discrepancy between the pressures attested to by Walt Anderson (before the game started), and the pressures found at halftime, can be entirely attributed to the cold weather (temp differential), rain (evaporative cooling), and faulty pressure gauges.
Bottom line #2: the things that
can't be stated for certain based on the Wells report, are the following:
1) Did McNally alter the balls after the umpire approved them?
2) If so did he do so when he was in the men's room? Or if not, might he merely have checked a few pressure readings (while in the men's room) to ascertain if the balls were at the desired levels?
3) Did TB direct McNally to deflate balls down to the level of 12.5 psi? Did TB direct McNally to deflate balls to a level lower than 12.5 psi?