With the new DC, the competition...
... really opens up. If Tenuta had stayed, I would've looked for Barnes, Bowen, and probably Sedric Griffin with B. Jefferson as an outside chance. The new DC may make this competely different. Who knows what he's looking for in the 3 linebackers in his system - speed, smarts, big/strong MLB, good in coverage, good blitzers, good tacklers against the run - who knows?
I would also imagine this would open the door to one of the freshmen LB's much more so than if Tenuta were staying. I think all 4 of the LB commits are quality players. Man, that's going to make for some great competition!
Obviously the guys that got playing time got it for some reason, so I still think that Barnes and Bowen are the frontrunners (Barnes especially, unless he has trouble picking up the new system like he did with CJT's). If I had to guess, I would pick Barnes, Bowen, and Griffin to start with Jefferson and a freshman pushing for playing time.