When you have a league that physically demanding that has done such a credible job of approaching parity, there is just no way anybody can maintain that kind of intensity for 17 straight weeks. There are going to be letdowns and nobody is immune.
Cutting the best DE you've had in 15 years because you think your simply going to go and magically find a better player at the position when you're drafting 25th every season is nothing more than a delusional fantasy, imo.