Tristan, just wanted to say that 
Lol!
I see what you are saying, and maybe the situation happened different than I read it...but the way I read it, Mosseri was told Yakovenko had more than pot.
"
Yakovenko said to Mosseri that he actually had more than the pot, but Mosseri still wanted a count on Yakovenko's entire stack, using a few choice words. With all the chips Yakovenko had, it took him and the dealer a little bit to break down all the stacks. When it was finished, Yakovenko was said to have had 407,300."
"At one point when Mosseri was in the tank, he did some talking about his hand out loud, which Yakovenko wanted him to stop doing. Mosseri had announced his hand, saying, "I have aces and one suit," while plenty of other players were hovering around. Yakovenko took this as Mosseri "polling his friends" about his hand. There was also a point when Mosseri looked back at his cards and Greg Mueller leaned down to peak in from behind, which Yakovenko also requested be put to a stop.
Mosseri tanked for what most estimated at 10 to 15 minutes before Yakovenko finally called the clock on him. "Wow, this is the first time in my life anyone has called the clock on me," said Mosseri. Mosseri was given a minute to act on his hand by the floor staff and eventually said, "I call."
Read more:
http://www.pokernews.com/news/2012/06/controversial-poker-hand-highlights-day-2-of-50000-ppc-12946.htmI do agree that Yakovenko did commit a foul, but it also looks like Mosseri was informed of it prior to action.
Mosseri should have no excuse for flipping up his hand when it was clear to him that it wasn't for all of his chips when he called. For all we know, this was an angle shot that he could use if he lost the pot.
Yakovenko should have no excuse for turning up his hand since he knew he wasn't all-in. For all we know, this was an angle shot that he could use if he lost the pot.
You can go even further and say that Mosseri committed another foul that we haven't even discussed. He revealed contents of a hand while there was still action pending...and he was informed that there was action pending before he did it.
Either way, there were a lot of crazy factors in this scenario!
I still stick with my answer of a call though. I feel that it is in the best interest of the game to minimize the damage. No matter which way you rule it, there will be people that think it was the wrong way. Ruling it a call, in my opinion, is the lesser of two evils here.