Someone should have blurted out, everyone vote for Jenna, after she gave away the immunity.
Only Heidi would have stood by Jenna. Rob would have sold her out in a minute. Matt and Butch were looking for a target, while Christy was foaming at the mouth to get one of the 'pretty girls'. Plus it has the added advantage of giving them an easy boot of Heidi next. Then they are all in the final four, just like that.
But no, Jenna rolls the dice, and survives. I can't stand Jenna, but it was a very gutsy move, and it paid off.