Which of these to flex, PPR

I’m on a 2 game losing skid, trying to turn it around.
I’m starting Cooks and Tate, but who to put in the flex?
Options are…
Mo Sanu
Sterling Shepard,
Jermaine Kearse (fresh off waivers),
C.J. Uzomah [maybe a stretch, but viable option)

Currently have Sanu in the spot, but with the hip, he’s iffy. I can easily slide Shepard there if Mo can’t go, as both play Mon. night.