I think the problem with Antonio, is that he is playing above his head. It seems to me that 500k is way above what he can afford to play with-especailly compared to some of the other guys at the table.
I think he's probably been a bit card dead, and he's playing a tight game waiting for the right hand in one of these huge pots. Now that Gold is gone, Sammy will probably quiet down a little (not much) and the flow of the game will be a little more even, so we'll probably start seeing everyone in a few more pots. I'd imagine that it's tough to want to limp in or call a small raise when someone is going to reraise to 20k every other hand.