CBJ said Peterman was the first in and last out of training. He gives a 110% and I think he played most of the first half with an injury but didn't want to admit it. He is supposed to be a good runner. Hard to say if he can become a starter again but CBJ would give him the opportunity if he earned it.
Ferg has the best all around skill set of smarts, arm, pocket presents (LOL), and mobility. Worley and Dobbs have many of these skills too but Ferg has a better composite. Worley was notorius for having bad 1st & 2nd quarters and was nervous early on.
Also, being the "veteran", Worley probably won't progress as fast as the Freshmen who have a much higher learning curve. Dobbs needs to work on overall S&C and especially accuracy. His decision making must improve too as he held the ball too long and took sacks.
My Assessment which doesn't involve watching practices, etc is: 1) Ferg, 2) Worley, 3) Dobbs, 4) Peterman with a relatively small gap between 1-3.