Roy Williams worth trading for?

[luhas316]

Im in a 16 team league. starts 1 RB, 1 RB/WR, and 2 WRs.

Ive been offered Roy Williams for Jonathen Stewart

My RBs: Kevin Smith, Rashard Mendenhall, Fred Jackson, Jonathen Stewart, and Tashard Choice
My WRs: Larry Fitzgerald, Eddie Royal, Johnny Knox, and Justin Gage

Should I take this trade? I would really like to add another WR and think Roy Williams could still be a solid number 2 fantasy reciever. I like Stewart but I think I can afford to ship him and be ok at RB with Mendenhall and Jackson.