One now has to be suspicious that the league would rather not know at this point. Why? Because we are just ten days from the Super Bowl and there is very strong evidence of cheating. If the league quickly learns who is responsible, it would have to suspend the cheater(s) from the big game or be mercilessly ridiculed for turning a blind eye. The NFL obviously does not want to suspend star players or coaches from its showcase event.
But now, the league will be mercilessly ridiculed anyway. There are very few people who handle the balls or might influence how they are handled between the time they are chosen and the time they are used in a game: the starting QB, the equipment manager, the ball boy(s), the referees, and the coaches. That means a competent investigation to get to the bottom of this growing controversy could be completed in a few hours – meaning, it should have been done by now. Plus, if you need to talk to the QB, you do it before he has to start ramping up his prep for the Super Bowl – meaning, between Monday and Wednesday of this week. You don’t wait until now, when he is turning his focus to the game.
If the NFL wanted to interview Tom Brady, it would have been done already. Football turns out to be a lot like politics: Officials avoid information because if they learn something bad has been done, they are expected to do something about it.