Nyheim Hines, or Mike Williams

Any help would be greatly appreciated. My RBs currently are Eckler, Tevin Coleman, Damien Williams, Ronald Jones, and Devin Singletary ( I am hurting BAD).
With the news of Mack possibly missing week 5. I was looking to pick up Nyheim Hines

Should I drop one of these guys for Nyheim Hines, or drop WR Mike Williams?