For a team decimated by injury this season, reinforcements are needed. There’s only so long you can continue fighting while troops are going down every time you suit up for battle. Many fans were hoping for those reinforcements to come from outside the 49ers’ ranks in the form of a trade. It appears the 49ers themselves are betting the cavalry will come with the returns of Julian Taylor, Ronald Blair, and Weston Richburg. In the meantime, they’ve had to watch their biggest division rival bolster their ranks with a two-time Pro Bowler. Did San Francisco make a mistake?