I don't agree when people say this. No one will ever know how good a coach Bellicheat would be (or how good Brady/Patriots would be) if he didn't cheat - because he did. People cheat for a reason - because they think they need to in order to win. And they continue to when they know it is giving them an (unfair) advantage. I do not believe Bellicheat comes close to the success which leads many to consider him "greatest ever' (not my belief) without implementing an unprecedented system of cheating over decades.