From another stand point I think losing a game can help you, cause it gives you something to work on and show what you need fixing. The Patriots never lost a game, and went to the Super Bowl in 2007, thinking they were perfect when in all evidence they weren't.
Yes the Saints did try, but they were bound to lose a game. Everyday in the paper, they were losing a starter, and I think had they beat Dallas, Payton would have benched his full starters for the last two games, and he did going into Carolina. They caught flac for letting the Panthers win that, but he was more worried about going into the playoffs healthy.
That's what scares me.
If the Packers go 13-0 or 14-0 and wrap up home field advantage, and the division, are they going to rest the starters or risk them getting hurt to go undefeated?
New England does this quite often, they'll go into the last game, play their starters, and even when it came back to haunt them by losing Welker in 2009, on a game that didn't matter. What if the Bears lost a key starter when they just had to play their starters against us last year after wining the division? It comes and goes. Everyone wants to go undefeated, that's cool. But I'd rather lose the last 2 games, and not lose a starter or go to the Super Bowl undefeated and lose it like New England did.
Even if we have it wrapped up by the last game, i think McCarthy will play his starters vs Detriot, for a fair chance to not let them make the playoffs, and that is cool with me, but I don't want to lose a key starter in a game that don't matter after we've got everything under our thumbs.