I think that the Rams would like to play Jackson at LT but again it would mean moving Noteboom to RT next year. By playing him at RG it gives him time to learn the position and develop muscle memory to play on the right side. Like I said in other posts, both Noteboom and Jackson will be their starting OTs next year.
It reinforces my perception that even if Anchrum starts at RG he's a placeholder for McClendon who has yet to be cross trained to play RG. People don't realize that the techniques of playing OG and OT are completely different. There is no guarantee either Noteboom or McClendon can make the transition to OG. If Joe can't then he moves back to LT with Jackson probably starting at RG for a year and then moving to RT next year. Either way, it sounds like they want to give McClendon a redshirt year to cross train at OG.