If the Rams draft a Center Brian Allen is cut, in fact, if they draft an interior lineman, he's cut too IMHO. Now if they draft a Tackle like Austin Jackson USC, they might change a few things, maybe Noteboom starts on PUP, but I do believe at the very minimum one OL will be called.
As to RB, would I love them to take somebody like Cam Akers or Clyde Edwards-Helaire early? Well, yes of course, but the Rams need other things and I just have a feeling they really like Zach Moss of Utah because of his ability to run inside and his effectiveness in the Red Zone. Darrell Henderson will be 1 and Brown will be 1A, however, Moss will eventually replace Brown IMO.
At WR, I realize this is a great draft and Robert Woods is a free agent next year, but how many WR's can make the roster? Barring injury or trade you have.....Cooks, Woods, Kupp, Reynolds, Webster so there is room for one more, however, Greg Dortch has an excellent shot to make the roster as a returner replacing Natson.
@BonifayRam has somewhat backed up your analysis by stating there are some guys like Cameron Shelton, Nate Trewyn & Chandler Brewer that could factor in to the offensive line, but again I have to believe if someone like Tyler Biadasz (Center Wisconsin) or Ben Bredeson (Guard Michigan) are sitting there in the 3rd round, the Rams make the pick or they could also take Austin Jackson in the 2nd round too....We shall see very soon.