My guess is he wouldn't have been caught. I assume his other accomplices gave him part of their winnings. His downfall was greed. His share of the others wasn't enough, he had to go for more. And he was too greedy to share it with a frontman on the last one so he bought it himself.
Had he stopped after he had accumulated a few million and called it good, he almost certainly wouldn't have been caught. If he had shared the last 12 mil ticket with a frontman, he still probably wouldn't have been caught, but who knows? Greed, greed, greed.