D. Brown or J. Stewart

[topkat2008]

J Stewart is currrently on WW as a free agent.

Should I pick him up and dump Brown?

Standard scoring 16-team re-draft league with 0.5ppr
Start 1 QB, 2 RB, 2 WR, 1 RB/WR, 1 TE, 1K, 1 DEF

My lineup:
QB Brady
RB Gore, Bradshaw, R.Torain, K.Williams, D.Brown
WR AJ, Holmes, Knox, VJax
TE Olsen
K Akers
DEF Eagles

Doesn't feel like Brown will do much even if Addai doesn't come back at all.
Stewart isn't much better this year, but at least based on his past, he can be a homerun come playoffs time where that seems unlikely with Brown.