There's a huge difference between being cleared to practice and being "game ready".
Absolutely! In his interview with Casey Phillips, Jones was asked about his availability, and his response was that he spent most of his time in the film room. He mentioned that he wasn't able to work on his strength training much because of his injury/rehab. Apparently recovery from back surgery and heavy weight lifting aren't always a good match right off the bat. Expecting Barrett to be game ready by Sunday seems quite a stretch at this point - and that's being charitable.
When Barrett does come back, I am expecting that he will eventually become a solid fixture on our line. While Jones may never be the most physically talented player on our O-line, he will surely be the smartest. If you had to choose a position on the O-line where smarts are at a premium, I would think that position would be at center. Hopefully Jones will have the opportunity to get his feet wet for a few games this season, enough for him to perhaps segue into being our starter in 2015.
Tru can't come back quickly enough - however - will he be game ready? Jake Long has taken a beating from Ram fans for poor play. Given the time frame he had for rehab transitioning to "game ready" his diminished play is not really mysterious. (IMO). If Jake can avoid further injury and play out the rest of the season, it will be interesting to see if there is considerable improvement in his performance by season's end.