Grab Drake or Rawls? Both are Free!

Not sure whether to drop a current bench WR or RB for the chance either of these evolve into a workhorse / solid RB2 ros. Thoughts?

8 team standard
Current RBs - Bell, Hyde, McCaffrey, Kelley
Current WRs- Cooks, M Thomas, Fitz, Cooper, Theilen

Also have Russell Wilson and Reed/Engram on the roster, those I wouldnt really consider dropping though.

Good luck to everyone on TNF!