I will address the last part first. I hate the idea of thinking that a raw rookie who has never played the position before, would ever be a consideration. The primary focus of the position is all about the mental side. My thought has always been to count the Center as "half a blocker". He is there to make sure everyone is on the same page first and foremost. So, no, I doubt seriously any of the rookies will be moved.
I was fairly indifferent as far as Rhaney goes. I think he is athletic, but I just didn't see much to think he can be the answer. To me, LAST YEAR, he was the classic, rookie, who was able to be successful in college solely because he was more athletic than his competition. If he comes back this year, bigger and stronger, than yes, he can compete for the job. But IMO, he is still a year away to being a legitimate contender. He should provide depth.
So, by process of elimination, it should come down to Barnes and Jones. My personal feeling, is that it's Barnes' job to lose at this point. They have had him here for 4 years, and he is a prime example of the developmental guy, who has gotten bigger, stronger, and is the most experienced of the two. Jones will have to prove he can A) Stay healthy, and B) himself gotten bigger and stronger.
Either way, IMO, whichever guy comes out on the other side of training camp,will be good to very good. I think Fisher and Boudreau have shown they have enough confidence in both. I doubt it was ever in their plan to draft a "plug and play" rookie at this position.