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NOTE: THIS IS NOT THE THREAD WHERE THE MESSAGE BOARD POSTERS VOTE FOR THEIR 'OFFICIAL' PICK. THAT THREAD IS HERE
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No big surprises here, I agree with most of the popular opinions that have been getting voiced since Monday, apologies for not getting a chance to formally post this earlier (although those monitoring my Spoiler Island picks are no doubt already aware of the below)

Reward Challenge

This seems to be the classic "fan favorite" SOS Distress signal challenge (which was a RC in S1, a IC in S3, and a IC in S4 but for some reason clearly identified as a RC in CBS' Ep3 press release.) The wierd thing is that, as shown by the last two times Burnett trotted this lame thing out, being that of all the game's challenges, it's probably the challenge that's the most subject to "winner manipulation," it's typically used to save a dying tribe from itself -- however in this case Burnett seems to be burning it as a RC instead of an IC that might help Saboga avoid Tribal Council for another three days.

So, for whatever reason, SOS Distress is a RC -- which means that since all the tribes seem pretty much equally bad off nutritionally, there's probably not going to be much of a "murky judgement call" angle on the challenge, so predicting Chapera as the winner (based on their joyful expressions) seems just as good a pick as anyone else.

Immunity Challenge

OK, the IC features the "open secret" that Jenna M. decides to quit the game sometime around the challenge to return home and spend time with her mother during her mother's final days (its believed that Jenna's mother lost her battle with breast cancer shortly after her return from Panama.) The only question is whether Jenna quits before the IC (perhaps after the RC?), at the IC, or, perhaps even immediately after a Mogo Mogo last-place finish in the Ep3 IC.

Whatever the sequence of events... Jenna M. is clearly gone.

Bootee

To sum it up:

RC Winner: Chapera
IC Winner: Probably no one... but definitely not Mogo Mogo
Bootee: Jenna M.