Prosise? Keep or Kick

Prosise was pretty much ruled out… do I hold onto him or drop him for another prospect? Available right now is Foreman, Richardson, Allison, Doctson who I all have a little eye on. Also out there are Forte, Lacy, Vereen who im not completely again either.

.5 ppr and im mostly in need of a RB to help me through a few weeks