Full ppr help!?!

QB - Herbert
RB - Josh Jacobs
RB - Mike Davis
WR - Devante Adams
WR - Metcalf
TE - Tasom Hill
FLX - ?

BE:
CMC
Antonio Gibson
James Robinson
Adam Theilen
Will Fuller
TJ Hockenson
Duke Johnson

In a Full PPR… who are you starting at the flex spot? I would start Robinson but his upside is capped against PIT. I’m thinking Theilen but wanna check in!