I am of the belief that Denard did not have as many progressions to go through last year. I think the spread passing game Rodriguez and Magee had implemented to that point was built on one to two reads that Denard had to make quickly whereas now Borges has the wide receivers running much more complex routes and which require Denard to wait and maybe make 4 to 5 reads.
I believe Rich made the game simple for him since he was just a first year starter. I also agree that he never scrambled last year either. There is one specific play that comes to mind. Against Illinois, he moved out of the pocket and had about 15-20 yards if he chose to run. Instead, he waited and found JR Hemingway for a play that ended up as a touchdown but I vividly remember screaming "RUN" at the tv.