Roster/Bench/Waiver question

I have a week 14 bye… looking at weeks 15/16 in 1/2 point PPR

7 of my 8 roster spots are locked in with studs (barring injury)… so all of this advice is for 1 flex starter spot.

On my bench:
TreQuan Smith
Tevin Coleman
Jordan Howard
Rex Burkhead

On waiver wire:
Keke Coutee
Jordy Nelson
Antonio Callaway

Would you drop burkhead or Howard to pick up any of the possible flex options above?