See my thread last year about "Stud QB Playoff Flop Theory."
Every year, at least one Top-5 QB has his worst game of the year in the playoffs. Last year it was Vick and Brees. This year it's Brady and maybe some others.
It's not that players are more likely to have bad games during the playoffs; it's that owners are less likely to bench them during the playoffs.
Stud RB Playoff Flop Theory..... A.Peterson zero pts last week..... J.Addai 5 pts this week.Stud WR Playoff Flop Theory.... T.Owens 3 pts last week and 0 pts this week (so far).
What I'm trying to say is that if you take the top 4 at every position and look at how they perform over any 3 game stretch, there's going to be a few stinkers.