He (like the rest of us) did not envision that Crist would crap the bed and Rees would not improve one iota. Even if at mid-season Golson was pulled from the scout team, he still would not have been ready for game action last year. Kelly did the right thing in redshirting him.
I'd rather have Golson for 2012-2015 than have him for 2011-2014. Kelly made the right call for Golson's long-term future.
All of this assumes that Golson will be the starter. If it is Hendrix, than Kelly should have played him more last year as he was ready for live action.