Oz what could Ivey have possible done even if all information was released?
Don't you believe he has enough money and is proven to enjoy the thrill of gambling why risk a thing by cheating?
*shrugs*
Beyond a certain point speculation is just silly given the complete lack of information. Personally I think it's highly unlikely that Ivey actually cheated - not necessarily for the reasons you mention, but because the game itself is fairly difficult to cheat at.
If you want to speculate further though, try my suggestion some months back about the possible cause for this - I spoke to a few people I know that are current or former dealers and supervisors in high-stakes salons and VIP rooms (not at the casino in question, or in the UK for that matter, but still) and they were of the opinion that when something like this happens, the most likely cause is that a supervisor overstepped their authority when they approved the raise in the stakes. When
their boss finds out the casino is down a huge sum because one high roller was playing three times higher than they'd been approved for, they payout gets held while they investigate.
It's also possible the management decided they needed to review the session given the sheer size of the win. Maybe they suspected one of the dealers of foul play, not Ivey... like I said though, beyond a certain point the specualtion just gets a bit silly.
Chances are the casino paid Ivey his money months ago, and neither party bothered to inform the public because at the end of the day, it's really none of the public's business. Which is why aside from the brief bit of titilation at the time I'm still really having trouble seeing why so many people, most of whom seem to have little to no understanding of how the high-roller B&M world works, are taking such a huge interest in this