Nick O'Malley of Mass Live broke down the Patriots' WR depth chart this way...
WR1 (Z - off line): Julian Edelman, Brandon LaFell, Matthew Slater, Derrick Johnson
WR2 (X - outside): Aaron Dobson, Kenbrell Thompkins, Greg Orton, Wilson Van Hoosen
WR (slot): Danny Amendola, Josh Boyce, Jeremy Gallon
So according to this depth chart, LaFell is playing behind Edelman, which means Dobson and Thompkins are competing for snaps at WR2. Dobson has the inside track, but his foot injury is worrisome.