This is not OL 6 through 9 but how I think the Rams will enter week one as the OL backup(s) for each position:
LT- Noteboom
LG- Edwards
C- Blythe
RG- Edwards
RT- Edwards
Hence why Edwards is getting a ton of work at multiple spots. I think he's the 6th man. He's also the one that will get starters' reps once a week when Whitworth sits out (Noteboom to LT, Edwards LG).
Demby can play LG and RG and that's it.
With Neary down I think their best pure backup center is Vitas H. I would give him 40 snaps at center Thursday night.