I need Waiver HELP!

Is either Cooper or D. Lewis worth dropping for any of the following on waiver wire:

I. Smith
A. Wilson
P. Barber

12 team 1/2 pt PPR.

The rest of my RB & WR
RB - Kamara, Conner, White, Ekeler, M. Wilson
WR - J. Brown, Adams, Gabriel, Kirk