It is really hard to tell anything about the Offensive line from OTA. The Rams have already said Allen is penciled in at Center and Noteboom at LG. No unless they show up terribly out of shape or something like that I doubt we learn anything new.
At LB I think it may be of some interest to see where they line Matthews up. Also interesting to see the sub packages and where Rapp is deployed.
Gurley coming out and running around pain free would tell us a lot and would be great.
I doubt we learn to much but I am sure there will be some rookies that are praised for how fast they are picking things up.