Actually, he picked up Cobb first from Coffeeville JC in KS. Cobb asked if they needed a RB, and suggested Rudi to the Auburn coaches.
This is similar to how we got onto Newton...and it's also why I don't really think Rollison is out of the picture for the future or is not working out.
The story (from the Auburn coaches) is that Luper was there (at Blinn) watching a wide receiver (Dexter Ransom, offers to Arizona, Cal, Oklahoma, Ole Miss, etc) and within about 5 minutes was on the phone with Malzahn and Chizik talking about Newton (who was throwing to Ransom).
It could be complete BS, but that's the story. They weren't necessarily looking for a Rollison replacement because Rollison "wasn't working out". One of our coaches was sitting there watching Newton with his own two eyes and thought "we'd be stupid not to bring this kid in for a shot".
No matter what coaches may think they have at any one position....until the season gets going, you just simply don't know. That's why Florida signed Newton and Brantley (and a 3rd QB) the year after they signed Tebow. You simply don't know.
It only makes sense to have Newton or Rollison starting and Newton or Rollison backing up. Isn't that most likely better than Rollison with Caudle backing up?
Best case scenario? Newton starts for two years, then Rollison comes in and starts his junior and senior years. That could be four years of having an upperclassman start at QB. Check history...traditionally teams are far better with upperclassman QBs than youngsters.