Help on FLEX

Who should i start at the flex position J.ALLEN or S.SHEPARD (PPR)?
(Starting WR B.Cooks, T.Hil & D.Adams - RB L.Bell & J.Mixon)

Buck as of now…seeing as Shepard is still “limited.” But I would either way, I think he’ll get more done vs the vikings then Collins this week

Thank you for the feedback