What I'm gathering from this final slate of preseason games when it comes to RBs..
TB - No Quizz or Sims. I don't think they split work evenly but Sims will see a decent amount come week 1
WAS - Perine started and didn't do much, I'm guessing they still want to see more from him
NYG - No Perkins. Darkwa got the first carry but him and Vereen mixed in evenly.
NE - No Gillislee, Burkhead, White or Lewis. I thought we might see Lewis.
CHI - No Cohen. We didn't see much of Cohen last week either which makes me think they're saving him
CLE - No Crow or Duke which isn't a surprise.
PIT - No Conner, Toussaint or even Davis (kind of odd)
CAR - CAP and Whittaker mixed in early, CAP is prob the direct JStew replacement and not worth much
NYJ - No Forte but it's beyond me that they let Powell play (along with McCown who was injured)
PHI - Looks like Clement and Pumphrey are battling for a roster spot, Pumphrey has been the least impressive
CIN - No Hill, Mixon or Gio which isn't a surprise
IND - No Gore, Turbin or Mack which isn't a surprise
GB - Williams started but Jones seemed to out perform him by a fair margin, this is worth monitoring
LAR - no surprises here, Brown didn't play and is the direct back-up to Gurley
DET - No Zenner or Washington, they know what they have with them
BUF - We saw a lot of Williams early here and he looked good as usual, I find it slightly odd that he saw work
ATL - No Ward, he's obviously 3rd on the depth chart
SF - No Brieda which means I think it's safe to say he's the 2nd string RB
SEA - Carson got work early followed by Prosise, Carson did really well on a blitz pick-up
If you want the TL

R version I think Cohen being held out, Jones pushing Williams and Brieda being the obvious #2 are the most important takeaways from these games.