I have not paid any attention to the mutt's offensive alignments and blocking schemes, so I am only repeating things I have heard.
The only people who have made any sense with this talk have said that the previous year's offenses used more movement on the offensive line.(Pulling, crossing, what I am not sure) The new offensive scheme is straight power blocking. The linemen that the mutts have are not powerful enough to perform straight power blocking like Alabama.
The problem with the radio talk and fan talk is that not having the personnel to perform a specific scheme is not a bare cupboard. If they ran the same offense as last year, I would assume the linemen could perform as well as last year. If your new coach ignores abilities of current personnel and installs a system designed for people he doesn't have, it is not a problem left behind by your old coach. Mutt fans have been under a delusion for many years that they are on par with LSU and Alabama. They really believe that all the team has to do is tweak some small thing and they will win the still MNC. They are and have been for a long time a second tier SEC team. They don't want to believe that, so they blame everything on: Refs, Bobo, Refs, Grantham, Refs, Richt, Refs, Lambert, Refs, SEC doesn't like them, Refs, Athens Police Department, and the Refs.