Black should have won

Ivey had Kh5h. Black had Ad2d. Ivey made it 50k, Black re raised to 120k. Ivey re re raised to 600k. Black then went all in. IMO Ivey looked very weak when he made it 600k, he was as still as a rock and his hand was up covering his mouth. His eyes also took on a really worried look when Black went for more chips.

As regards showing the hand, it is a no brainer. Of course you show somebody like Ivey a bluff like this, it means they will not mess around with you from then on in. That play in my opinion was the reason Ivey didn't win this years world series, he was visibly rattled by it and didn't regain his composure, eventually going out with JJ vKK.