Flex Question... DWestbrook, Cohen, Drake, Foster or MWilliams

Who should I start half point PPR, Dede or Mike Williams? Big implications. If my opponent wins the dynasty league is done and he take the rolling pot.
I have
QB: Wilson
RB: MGordon and Howard
WR: Diggs and Evans
TE: Kelce
Flex: (Williams, Dede, Drake, Cohen or Foster)
K: Elliot
D: Jags
My opponent has
QB: Goff
RB: McCaffery and Gurley
WR:Edelman and Sanu
TE: Gronk
Flex: Larry Fitz
K: Myers
D: Bears

I’d start Cohen

Roll Cohen