Well to start with Peter is no Chris Parker, at least Peter can do a reasonable ballroom routine, his Viennese Waltz was rather good.
AND as long as he can avoid latin he probably should stay in the competition.
Similarly he has improved, whereas some celebs have NOT, infact IMHO, and it is only M very HO a couple of the celebs are actually getting worse, nerves, 'other commitments' or whatever, but there has been a definite down turn in at least two couples.
As for this year I am getting the idea that it seems the public get the decision, the only problem being it is a week late. Georgina and Jan are probably the best examples I can think of.
It is the first week anyone considered Peter the absolute worse, the problem with Chris Parker is that he was the worse from quite an early stage, week after week he was bottom with the judges and week after week the muppets saved him. That has not happened YET with Peter.