Confusing Start/Sit

I am the Davante Adams Owner and dont want a possible 0 for a Sunday night game. I also have Hollywood Brown for Monday night which is my backup plan. This means that Adams is in my lineup and I have to keep Brown on my bench in case Adams is out Sunday night. Who should I start in my flex: McKinnon, Gibson, Djax, or Josh Kelly? (Full PPR)

For me this is easily McKinnon, Djax might not play and if he does will he be 100%?
I think McKinnon has the highest floor and also a good ceiling with Mostert not playing

I actually think Kelley has the highest floor and ceiling. He will get 20+ carries against Carolina playing from ahead, good chance at a score as well. Jeff Wilson might see the bulk of SF carries.