I’m not excusing any cheating, if it happened. I’m only disputing whether an under-inflated ball is an advantage. The evidence does not correlate that it is, which was your claim.
I doubt the balls had any real impact on the outcome of the game.................
Tom Brady has openly said he likes his footballs under-inflated. So, he thinks it is an advantage.
Of course, an under-inflated football in the rain is easier to grip, throw and catch.