I can't believe people are still speculating over this. It's obviously Jason giving away the immunity necklace then getting booted. What else could it be??
I don't think he wins and then gives up the necklace. I think he just gives up in the IC after making a deal with Ozzy. Of course, if he DOES win and gives up the necklace, then that's even stupider..... so I'd love to see it : )