I'd be surprised if Chico, Mock, Balester, and Bergmann all made the OD roster. Mock or Bergmann are my picks for non-tender/AAA.
Well, Hernandez isn't on that list either, and I would be shocked if he didn't come north, regardless of what happens in ST. I figure Bergmann will end up in the bullpen. And I figure if Mock nabs a spot in the rotation, and Olsen is healthy, and/or Chico really shows he his back to AZ form, that there will be limited space for some guys. It's one of those good problems to have for the organization, but it is tougher for the guys on the bubble. I've been high on Balester since I saw him in ST back in 2008. He had the cheese and his curveball was sick. It seemed it would all come down to a combination of a third pitch, keeing the ball down, and being able to work as effectively out of the stretch. He has stuff I would like to at least be able to tap out of the bullpen, and I'd like to see him get more work against big leaguers at this point.
But most of the decisions will end up being the smart baseball moves. As long as you are bringing a veteran like Hernandez north and not a DCab, it comes down to options. Injuries are inevitable, and trades are always possible. The guys with options will be on the shuttle. They need to focus on taking advantage of the regular work until they are called upon.