I'm a Raiders fan, and even with the hot streak Carson's been on, I'd be hard pressed to start Denarius over Felix. Oakland's WRs are still fairly unpredictable, even with a good matchup against NO. I see it as a risk/reward scenario, and if I was in a must-win situation, I'd probably go with the starting RB in the flex spot.
Jones has a great matchup, plus he's the feature back, unlike Bell. On one hand, even if Detroit gets down early (which I'm sure they will), I can't see the backs getting many dump passes from Stafford. Then there's the fact that he'll be sharing snaps with LeShoure. On the other hand I'd say Dallas will get an early lead, and use Felix more to run the clock.
I'd go with Jones, seems like the safest bet to me.