I like Michael Carter here. You need a second RB, and he’s a good one, with only “Fragile” Tevin Coleman standing between him and full-time carries. Until then, Carter is likely to be the 3rd down back, so you’ll get some PPR value from him there.
Diontae Johnson has the greatest value of all those players, but yeah, you’re starting to run out of RB options. I’d probly take Robinson among these options, if I din’t take Johnson.