Cancellara is saying that there is no way that Contador would've won the individual time trial had he not benefitted from preferential treatment from the UCI. Link below.
If you watch the stage, Cancellara does have a valid point. The motorcycles following Contador are alot closer than those that followed the other riders. The big thing is that while the rest of the riders only had one motorcycle ahead of them, Contador had two. Anyone that has ever done motorpace training knows what a huge advantage a motorbike is in drafting. The motorbikes are too far away to get a huge advantage, but the fact that there were two and over the course of a long 40km time trial does gives support to what Cancellara is saying. If Cancellara is right, the overall standings would be alot closer between 1st and 2nd right now.
Fabian Cancellara speaks out at preferential treatment for Alberto Contador