To repeat myself from another thread, I actually fail to see the point of a comparison. The contestants should be compared to the standard required for the dance - technically, artisitically etc and for their own improvement. Even to base marks against what others have achieved in that particular show seems a bit daft to me.
Hard enough to do the dance, let alone wonder how you compare to some other random celebrity from a few years ago.
I don't post often but read a lot and this is one of the things that sets my teeth on edge (there are a few more about the show in general and this forum as well); in fact, it gets even more ridiculous when further comparisons are made between dancers of the opposite gender in Dancing with the Stars (I mean - what?).