Week 15 Struggles - help me choose please

I have McCaffery/Kamara in at RB for week 15, but Mostert is available on the waiver. Would you play Mostert vs. Atlanta over Kamara vs. Indy?

I have Keenan Allen in my flex and Edelman/DJ Moore in at WR so I think the only one I’d truly consider starting Mostert over would be Kamara; what do yall think?