Raiders RB Rashad Jennings vs. Cowboys LB Ernie Sims: It’s up to Sims in the middle to replace the instinct and play-making of Sean Lee. But that is a tall order, and it’s made tougher against a big, physical back such as Jennings, who has the most yards from scrimmage over the past four weeks in the NFL. The Raiders are a power, downhill running team. The Cowboys can’t afford for Sims to be overwhelmed.