Kupp vs Shephard for flex (because concussion possibility)

I have Cooper Kupp currently sitting in my flex but I also have Sterling Shepard sitting on my bench who has a pretty nice matchup this week against a weak Eagles seecondary. Would you roll the dice and see if Kupp plays Sunday or would you just swap in Shepard. I have Adams and Juju in my 2 WR spots so I won’t be swapping Kupp in for one of them if he is active Sunday if I were to play Shepard at flex.