I also liked Sheldon, but I absolutely think that Kristen is the best chef in the competition by far. Sheldon seemed like a good guy and he did have a unique perspective, food-wise, but I think Kristen is the best of the group and should win barring some Blais-like catastrophe.
BTW, did it seem to anyone else last night that Brooke and Sheldon were caught off-guard by the challenge? Not that Kristen was back, but that the challenge wasn't the final meal, but just another elimination. Sheldon made some mention at Judges' Table about having a dessert planned out for the final challenge, so I got the impression that he came prepared to cook one particular meal and wasn't quite ready to do anything different from that.