Like Zac and Laurence, if that one other team is Jenna and Ethan, there's a compelling story there beyond the Survivor connection, namely Ethan's a cancer survivor and as I recall it was a very life-threatening situation for Ethan when it was diagnosed. Also, Ethan has been a tireless promoter for youth soccer (or football, if you prefer). If it's those two, I wouldn't have a problem with their being cast because of the Ethan backstories; he's earned it, IMHO.
Zac's solo voyage around the world was a tremendous personal accomplishment. Little doubt it would be appealing to Lynn, Bert, Elise and especially Phil.
Question could the Jenna-Ethan team be the team that was documented at a ticket counter by tweetpic that came out last night?