The problem with dialidol is these days very few people use it for voting for any show, and DWTS has always been really low.When the sample of several million votes is only a few hundred (I think for the finale it was a total of 150 or so votes) it may not be enough to get a good sample.
Also it doesn't sample any of the facebook or texting votes, either.
So it isn't as good for predicting as it used to be.
And that is before we get into some of the conspiracy theories that the busies for Shawn may have been from producer manipulating the lines.