Exactly oneeye, and similar can be implemented here. A player does not all of a sudden start shooting near perfect rounds when his stats say otherwise. Yes, players improve, but the rate of improvement needs to be looked at.
There is a player out there at the moment that was very average, but now seems to be shooting some of the best scores in all the tournies. I play with lots of top players and it's actually quite funny that they're all asking, what is going on with this guy. Surely WGT can see that this is going on. As I said players will improve, but either someone else is playing on this guys account or he has some help of another kind.
To bring up chess again, it's like me being a 1600/1700 rating player for 2 years and suddenly winning all my games and shooting up to 2200 in a couple of months, it doesn't happen.