I only see two ways a Fan can win:A) Jason wins every IC from here on in and wins the Jury's vote. Highly unlikely...and even if he does the Jury will be mostly stock with Anti-Darwin advocates and will probably vote against him out of spite.
B) The F3 will consists of two Favs and one Fan. All three Fans on the Jury vote for the Fan and the four Favs on the Jury split the other votes 2-2.
In either scenario I don't see the Ozzy boot as a factor. I'm not sure why you have Parvati as the culpit of his boot but this was a team effort. Everyone was talking about it. When you have a bevy of weak inept "survivors" it's blatantly obvious to target a solid performer such as Ozzy.
As much as some think the game is no longer Fans vs. Favs when it comes to the Jury vote I believe the Favs on the Jury will vote for a Fav in the Finals. Just my speculation.