I think the fact that so many of the game balls were found underinflated tends to point to science rather than human tampering. Do you have an idea how hard it would be for a ballboy to mess with 11/12 or maybe all 12 of the footballs with all the video cameras in the stadium going nonstop during the whole game?
It sounds like mission impossible to me. And how did the ball assassin, manage to deflate all the balls to around the same level - 2 lbs less or 1.5 or whatever with such precision in whatever limited time he had to do it, if there was ever a window to do it, under all that surveillance?