Their job was to work the balls. Tom liked the balls broken in and as deflated as possible. Like any other staffers on any other team, they’re allowed to do whatever the hell they want with the footballs, provided they don’t tamper with them after game submissions.
The investigation was initially about whether or not Brady orchestrated a complex scheme to get a massive advantage. Then it became about whether the ball boys deflated them in a bathroom. Then it became about whether any reference to deflating balls could be found, even though the context about deflating balls makes no reference to any underhanded activities.
The idea that two guys whose job was to prepare footballs the way Brady liked them - used the word DEFLATOR - doesn’t actually prove or even suggest anything. Especially since there are other references to legal ball pressures and references to the refs inflating them way too high, but no reference during those exchanges to any type of sneakiness. “I’m going to ESPN” is one of the dumbest attempts at a smoking gun I’ve ever seen.
In terms of Brady’s knowledge, the idea was initially shoved down everyone’s throat that he is so precise (Belichick too) that he knows the ball pressure to a micro fraction. And other QB pundits falsely asserted they knew, too, which looks idiotic in retrospect considering weather changes. But after reading the transcripts, I think it’s obvious Brady had absolutely no clue what the hell PSI even was, though he, like any QB, preferred the balls to feel a certain way. He tried to explain that during that first press conference, yet he was panned for it. I don’t think he even knew what the hell they were talking about regarding specific air pressure levels. I don’t think most QBs at that time knew what the hell they were talking about.
This was all based on a false media report suggesting the balls were extremely underinflated and it was so obvious as the public thought they were basically playing with a squishy ball. The goalposts of the investigation changed at every turn. Just look at the initial bombshell conclusions from everyone the day Deflategate broke to the pathetic, watered down conclusion: “generally aware of a possible change of 0.003% PSI, maybe, which didn’t give any advantage but possibly could have? Also, wouldn’t turn over phone could be a bad thing 2? I dunno...LoL - Ted Wells.”