Fantasy football help!?

In my league, you can start up to 3 WRs, on in the FLEX or a RB. For WRs i have Mark Clayton, DeSean Jackson, Patrick Crayton, and Greg Jennings. Jennings has a bye so i have to start Clayton, Jackson, and Crayton. For RBs i have Chris Johnson, Ryan Grant, and Tim Hightower. Clayton is only projected 3 pts this coming week. I'm thinking about dropping him for a different WR or drop a RB to start in the FLEX. Any ideas???