Must win Dynasty flex help please

I have a division game this week in my dynasty and I view all division games as must wins as that is the easiest path the playoffs. I seriously am struggling to decide who to put in my flex, it’s a full point ppr. My opponent and I are projected to basically score the same amount of points. I currently have Allen Robinson as my flex but my other options are Westbrook, Kirk, C. Samuel, Crowder, L. Murray, Lindsay, and Hyde

The rest of my starting roster is
QB: Rogers
RB: Kamara, McCoy
WR: Watkins, Woods
TE: McDonald
Superflex: RIvers