Forget all the playoff scenarios...while the front office, coaches, and maybe the players know them, it doesn't matter like it does to fans trying to think a way to the best playoff pairings.
1. Players play to win the game.
2. Coaches coach to win the game.
3. To win, a team must believe they will win against any opponent, so why not go through a good team early instead of later.
4. Coaches and players don't worry about playing not to get hurt.
Bottom line---Romo is healthy and will not be healthier for sitting, so he plays to keep the rhythm and momentum going, to go into playoffs hot with another win. The only reason to sit a starter is if he cannot perform close to 100% and the week's rest will make him 100% the next week, so someone may sit, but very few.
Resting starters is not good for the team if it results in losing. Even if the loss doesn't change the playoff position, it does change the team's mojo and the next man up mentality in case someone is injured during the playoffs. Winning is always important, and losing is never without consequence. You cannot play the game or coach the game in fear of injury.
Play to win and roll into the playoffs with the greatest swagger.