So far none of the remaining celebs have been truly tested, as the likes of Mark, Don, Heather and Andrew were not popular enough to compensate for their low placings on the leaderboard, so were easily pushed into the dance off in weeks 5-8. Everyone goes on about how unpopular Heather was, but she avoided the bottom 2 the week Mark left, even though she was in the middle of the leaderboard. Some of the remaining couples may consistently be polling even lower than Heather but have been too high up on the leaderboard for it to matter.
We know the public vote isn't static - in week 2 Heather got more votes than Jodie who was one place below her, but on saturday Jodie certainly got more. Far too many variables affect the final positions that it's a difficult one to call without seeing the dances and the scores.
The only thing we can say with any certainty is that thus far, John Sergeant has been more popular with the public than many others. But even this could change come saturday.