Have any of these credible people stepped forward to verify your claims?
What if another group got the other side of the plays from one of your partners?
If your fee is commissioned-based, do you refund previous fees received for subsequent losing plays?
How do picks in a free contest establish that you've bet any meaningful sum on those games?
It sounds like these summaries are similar to Win/Loss statements from casinos. They don't establish that you've won overall, just that you've won with certain books. You admit that you could cherry pick the results to make you look like a winner.
You can tell any number of stories, but how can it been established that Billy Walters ever hired you?