Time to drop J Witten DAL?

I'm in a Dynasty PPR League, and Witten has drastically underperformed this season. Dallas seems content on feeding Murray (also on my team thank God) and Dez, leaving Witten odd man out. WW options are O Daniels BAL, C Clay MIA, C Fleener IND, or J Gresham CIN. Should I drop Witten for one of them? I already have M Bennett CHI, who was solid but is now been suffering at the hands of Cutler. Really not sure what to do.