Depending on how early you pick your #3 back, players like Barber, Bennett, or maybe even a Dillon might be available. All would be adequate #2's, but awesome #3's.
If you're talking about RB's out of the top 20, then I'd have to say either Duckett (Gibbs will work miracles) or the rookies J. Jones and K. Jones, both of whom seem to have the starting gig in hand.

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