Our injury problems are not THAT bad right now. It could definitely be worse. Remember the year where virtually every DB that played a down for the Rams got hurt?
It allows Pead a chance, and Cunningham get do fine. Neither are Gurley or Mason but they can get the job done. Remember, Pead was never terrible at RB, he just fumbled his chances and was in Fisher's dog house too much.
And there is always Tavon.
And as for moving Brown to LG, I don't see it being a big issue. I bet he learned a lot more partnering with our other rookie Havenstein then he would have next to G-Rob. Him and Brown grew their knowledge together and I think that trimmed some of that learning curve. However, Saffold's best position has always been RG.