I think we'll know better after this week's episode. Trying to guess two weeks ahead at this point is pretty futile. Wait, wasn't there something about one of the tribes having an age split this week? With someone in the middle? That would be Christy in the middle, wouldn't it? And, she'd be the swing vote. Ergo, NOT vulnerable! Unless (sorry, I'm following a thought line here) she tenatively hooks up with one group this week and then gets snubbed by them NEXT week (cough, Jenna, cough) and decides that she's going with the OTHER age group?
Does any of that make sense? If not, blame it on sleep deprivation.