Kamara and Murray?

Is it foolish to start Kamara and Murray? My flex is taken care of with a WR, but I need to figure out my RB slots. I have those two then Jamaal Williams and Gus Edwards. Murray is the best second option per the rankings but am I exposing myself to too much risk to play both RBs for one team?

I have both and I’m strongly considering Murray. I just don’t trust Hill or Payton to give Kamara touches until it happens