Didn't he play on the second line with Hossa and Sharp most of last year when he only managed 44 points? Playing with Kessell and Bozak or Grabovski is a giant downgrade in linemates this year. Sure the extra 2 minutes a game might net him a few more points but he's not going to break 60, will be a giant minus, and the rest of his secondary stats suck.
The right answer to this question is move Marleau over and look for a center. There are always useful centers on FA who blow away the bottom 3rd of rostered LWs.