Last minute Flex Decision

[Sam]

.5 PPR, 6 pts for all TDs - Who would you start in the flex?

Randall Cobb vs. Det (nothing yet this year but good matchup)
Sterling Shepard vs. Was (Been great this year and a good matchup)
Phillip Dorsett vs. SD (chance to shine with Moncrief out)
Justin Forsett @ JAX (hasn't shown much this year but good matchup)

I could start Forsett over McKinnon or Langford at the RB position as well.

Thanks!