No one is ever going to have the smoking gun. To get it someone would have had to wrestle his phone away from him at the table or snatch his hat off of his head to see exactly what it was that appeared to be stuffed inside it while he was playing, but was gone later. The person overseeing the game, with the standing and authority to take the kind of action that could have determined one way or another if cheating was going on or not, is the person who was likely in on it with Postle. That same person dismissed any concerns or suspicions that were brought to him. That's why other's in the poker community were asked to look into the situation. Once so many eyes were focused on the situation, the pattern was easy to spot. If you don't see it, it's because you don't want to see it.
Look, the other day I had just finished mowing my great uncle's yard. I was riding my zero turn down the side of the road when I came close to running over a dark colored, thick bodied snake. It had held it's ground until the last second. But then it must have felt the vibrations from my lawn mower and realized that it was too big to take on. It threw itself out of my path and into the drainage ditch just as I started to reach over and turn my blades on. As I went by I could see it go up the other side of the ditch and disappear into the undergrowth. It seemed to swim more than slither even though it was on dry land. I could tell from it's coloration, the girth of it's body, the abruptness of it's tail and the way that it moved that it was a cotton mouth. As I didn't, jump off of my mower and attempt to wrestle a poisonous snake out of the undergrowth, there is no way for me to prove it was cotton mouth. In fact, there is no way to prove that I saw a snake at all. But I know what I saw, even if I don't have the proof.