Week 4 of the NFL season is in the books. This season is flying by and you should have a good idea of how players are going to be used moving forward. Still, injuries happen and sometimes you have to make adjustments on the fly. There were some devastating injuries this week, especially at the running back position. That opens the door for backups to step up and make a difference. Here are the fantasy football waiver wire pickups for Week 5. As usual, the owning percentages are taken from Yahoo!.