Need a Flex Option PPR

Assuming that Fuller is Active and I don’t need Manny at my WR slot, the following options are my flex options for this week, thoughts on who I should start?:

RB R. Mostert SF (v ATL)
WR E. Sanders SF (v ATL)
TE I. Thomas CAR (v SEA)

For reference, this is the rest of my lineup:
QB L. Jackson BAL (37.08)
RB S. Barkley NYG (v MIA)
RB D. Cook MIN (@LAC)
WR C. Kupp LAR (@DAL)
WR W. Fuller V HOU (@TEN)
WR K. Allen LAC (v MIN)
TE T. Kelce KC (v DEN)
FLX (Help Needed Above)
DST Ravens BAL (7)
K J. Myers SEA (@ CAR)

I’d say Mostert since he will have guaranteed touches also with huge upside.

Mostart for me. They said he is the lead back now and it’s a run heavy offence so his upside is great