I have been saying this was going to happen for awhile now, and the only thing that was going to get in the way of him re-signing with the Rams was his visit to Kansas City. (which happens to be closer to his hometown). That being said, IMO, this is a very good move.
For all the talk about how Barrett Jones had "re sculpted" his physique coming into 2014, no one worked harder than Tim Barnes to get bigger, stronger coming into Training Camp last year. The physical change in him was apparent just looking at him. While in 2103, he got the opportunity to start the last 4 games of the season, he was not nearly physical enough. When he came to camp in 2014, he looked like an NFL lineman. Had he not suffered the pinched nerve in his neck in camp, a shoulder injury during the preseason, and the rib injury in the first month of the season, IMO, he would have taken over the starting Center job.
Now that he is back in blue and gold, I believe he now is the front-runner in the starting Center sweepstakes, barring a FA signing (Wisniewski). He is entering his 4th season as a Ram, so they obviously see something positive in what he brings to the table.
The thing is, for me anyway, is most fans look at a player like Barnes, and only see the player he has been to this point in his career. While I understand that's the only point of reference they have, Tim Barnes is the perfect example of a player who DEVELOPS into a very good NFL lineman, and he is right on schedule in both timing and experience to have that happen.