The 49ers head into the Wild Card round facing a familiar problem: injuries at the worst possible time. With the defense already shorthanded — and major questions surrounding Trent Williams and Ricky Pearsall — the margin for error against the Eagles is razor thin.In this breakdown, Steph and KP dive into the key matchups that will decide 49ers vs Eagles, how the injuries change the game plan on both sides of the ball, and what must go right for San Francisco to pull off a road playoff win.