I think Malcolm and Reynold both have very good chances of winning. If the Strong Guys alliance gets picked off, whoever is the last one left has a really good chance of making an immunity run, and Malcolm has an idol to back it up. Even Philip has a fairly good chance - he's wacky and this Stealth R Us thing is one step short of mental illness, but he's keeping a strong alliance together, is really good at challenges (especially for being his age), and the only person he really infuriated missed being on the jury. His chances are a lot better now than they were three or so weeks ago.
Eddie, of course, is dead man walking.