A lot of people in this thread not understanding the difference between "leaking" and "reporting." There are perfectly reasonable reasons to dislike Ariel, but this isn't one of them. The guy got the scoop on a matchup and reported it, which any journalist would have done. Guys like Adrian Wojnarowski, Adam Shefter, and Tim Kurkjian literally have built careers on breaking news, and they're hailed as sports reporting icons. You would never see the the commissioners of the NBA, NFL, or MLB say anything negative about a reporter who breaks a story.
This is just an example of Dana and his megalomania. And the low-IQ mma fanbase blindly following his lead.
***edit***
It boggles the mind that so many people have zero understanding of how reporting works. He wasn't a UFC employee; at this point, he wasn't even a FOX employee. Ergo, it wasn't a "leak." He broke the news. Period. Any suggestion that he shouldn't have broken the news without King Dana's blessing is utterly asinine. That's not how news works. And the fact that the UFC was going to make an announcement a few hours later doesn't actually affect the analysis; breaking news is often a matter of minutes, let alone hours. If it's properly sourced, you don't wait for someone else to reveal it. Again, that's asinine.