Help me out here. Loaded at WR but need a RB

12 man standard scoring league. We can start either 2 RBS + 3 WRs or 1 RB + 4 WRs.

I lost Skat, so my only RB now is Dobbins. I can roll with Dobbins and start 4 WRs from Cedee, Chase, Rice, Nico, Terry, Franklin. Someone is offering me Harvey for Franklin, which is kinda a no brainer bc that means I’ll always have the DEN starting RB if god forbid Dobbins gets hurt. I can also trade Terry for Tracy, which would give me Dobbins and Tracy at RB. I guess the ultimate question is, who is better in my flex spot ROS - Tracy or Nico/Terry?