Need a new flex play

I originally had AB as my flex but since he is on covid protocol I need a new one (if he gets cleared he’s going back in though).

Full PPR: I have Tyson Williams, Elijah Mitchell, Noah Fant, Gaskin, and sterling shepherd (I have Barkley as one of my running backs this week) as options?

Any ideas would be very helpful

Mitchell if he is a full go, otherwise probably Ty’son.