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Brown actually plays against the Raiders this week, who just got 111 yards put on them by Brian Hartline. I'd say start Brown if I thought he would score, but that's not close to a sure thing.
The Bengals have given it up to RBs as well as QBs, so Morris is probably your guy this week. I'm not sure if Jackson's going to play.
If I were you, I'd keep a close eye on who appears to be starting at RB for the Giants on Thursday. If it is Brown, I think he's easily worth a start against the Panthers. You could lock him into an RB spot and leave your flex open for Sunday's news on S-Jax.
I prefer RBs in the flex unless there's a glaring differential between an RB and a WR.
Of course you'll start Lynch in the other spot.
For the two WRs, gotta go with Wayne. And you probably have to start Marshall, too. But LaFell might have a big game. I'm waiting to see if Prince Amukamara is going to play.