I think that most of the talk you hear is reasonably accurate, but you never know what plans end up going through and what don't because they don't show you everything.
However, in this case, T went to John and told him about the plan to get rid of Burton. John went to Sandra and told her what T had said, adding that T had asked him to vote for Burton this week with the promise of voiting off Sandra next week.
Apparently, everything on the show thinks Jonny Fairplay is honerable, even though they should know better by now. This time it all fell in his lap, he didn't even have to lie. But the truth makes T look like a bigger threat then John, so Sandra, et. al. decide she can't be trusted and lose their advantage.
At this point, John, Burton, and Lil are as good as the final 3. With that situtation, there is a good chance that John takes it all.
In the after show wrapup, they confront him with his lie in front of the other survivors, but all of the other survivors simply comment what a brilliant player he was to have even thought of such a scam.
Anyway, that's my understanding of what happened and my prediction for the rest of the show. I hope I'm wrong because I really would hate to see someone as slimey as John take the money.