Freeman is the epitome of a backup RB. Decent size, decent speed, decent hands as a receiver but has never put it all together. That said how much is the scheme and OL to blame? Hard to say. But with Akers, Williams, and Evans ahead of him and yes I put Evans ahead of him, he's going to have to earn his chops on STs. Akers and Evans will carry the load and Williams looks to be a decent rotational RB.
Sorry to see Sony leave but he has nothing to prove anymore and with his rings he can retire on a decent career. He was a good RB and a solid teammate, what more can you say? Freeman comes in with no real expectations so no pressure on him. The Rams are 3 deep at RB which is solid going into the season.